The leaves are changing colors, the sun is setting earlier, the air is becoming brisk ... and everyone's getting a little bit friskier? Well, maybe not everyone, but according to Business Insider, fall is the "season of sex," and science can prove it. Getting busy as autumn rolls in supposedly helps combat seasonal depression, and researchers have found that both testosterone and estrogen levels go up during this time of year.

All seem like excellent reasons to starting having a lot of (safe) sex as soon as possible, but we also brainstormed 16 completely unscientific reasons to get laid as the leaves fall:

1. You don't have to wear tights yet. Let's face it: removing a pair of control tops is never sexy.

2. It's getting chilly, but your landlord hasn't turned on your heat yet. Rather than walk around in sweats and pile on extra blankets, pile an extra person into your bed.

3. Hot apple cider is a highly underrated aphrodisiac.

4. You, too, can have a romp in those just-raked leaves. Why should catalog models and rom-com actresses have all the fun?

5. Everyone looks sexier in fall clothing. More coverage, dark colors -- when did everyone get so good-looking?

6. Undressing each other is more exciting when you're wearing more layers. During the summer, you're more or less naked all day long, and so is everyone else. No reveal, no anticipation.

7. You're no longer sweaty all the time.

8. It gets darker earlier... so you can get to it faster.

9. It gets light later. More time for morning sex.

10. Your team made the winning touchdown. It's football season -- victory sex anyone?

11. Your team was crushed. Can't get the loss off your mind? What you need is some distracting defeat sex.

12. If you happen to live in the Mid-Atlantic region, it rains a lot during the fall. The inclement weather is the perfect excuse to spend the day engaged in indoor activity.

13. Halloween sex. Also known as the perfect night to act out those unexplored role-playing fantasies.

14. Trying to get in shape (even if it's only so you can eat more at Thanksgiving)? Sex burns calories.

15. After you're done having sex, you can steal your partner's sweater.

16. Maple syrup. Friends, use your imagination.

Anything you'd add to this list? Let us know in the comments!

Related on HuffPost:

Loading Slideshow...
  • Fall Activities Can Be A Fitness Opportunity

    Take advantage of autumn activities and chores -- like apple and pumpkin picking, and raking the fall leaves -- to burn some extra calories. According to <em>Reader's Digest</em>, just a <a href="http://www.rd.com/health/diet-weight-loss/8-ways-to-burn-calories-without-noticing/">half-hour of raking leaves</a> can burn 50 calories. And <a href="http://shine.yahoo.com/healthy-living/ways-to-burn-300-calories-in-the-crisp-fall-air-522100.html">going apple-picking</a> for an hour and a half can torch more than 300, Yahoo! Shine reported.

  • Take Advantage Of The Seasonal Bounty

    During the fall, "fresh fruits and vegetables are in great supply -- visit your farmer's market and stock up," Hagen says. Some of our favorites: <a href="http://www.huffingtonpost.com/2012/09/06/health-benefits-apples_n_1855590.html#slide=1470126">apples</a>, which have cholesterol-lowering powers due to their high fiber content; <a href="http://www.webmd.com/food-recipes/features/pumpkin-recipes-packed-nutrition">pumpkins</a> and <a href="http://voices.yahoo.com/yam-vs-sweet-potato-nutrition-health-benefits-compared-2643896.html">sweet potatoes</a>, which are both rich in vitamin E and low in calories; and <a href="http://www.medicaldaily.com/articles/3444/20101108/health-benefits-of-figs-and-fig-leaves.htm">figs</a>, which have high levels of fiber and potassium. For more fall superfoods, <a href="http://www.huffingtonpost.com/2011/10/17/7-fall-superfoods_n_1007886.html">click here</a>.

  • Embrace The Cooler Temps

    At the beginning of fall, temperatures are finally starting to drop -- so what better way to celebrate than by heading outside without having to worry about <a href="http://www.huffingtonpost.com/2012/08/17/body-heat-infographic_n_1792121.html">heat-stroke dangers</a>? "The temperatures are moderate -- therefore getting outside for fresh air and activity are easier and more comfortable," Hagen says. But he notes that as early fall passes and late fall sets in -- and the temperatures drop even <em>lower</em> -- that'll push people indoors. We should "take an opportunity to remind ourselves how to share friendship but not germs," by practicing basic health behaviors such as washing our hands and getting a flu shot, he says.

  • Reap The Benefits Of Daylight Saving Time

    On Nov. 4 of this year, we'll be able to get an extra hour of sleep because Daylight Saving Time is ending. This is not just good for our tired bodies, but it could also have a <a href="http://www.nejm.org/doi/full/10.1056/NEJMc0807104">beneficial effect on heart attack risk</a>, according to a <em>New England Journal of Medicine</em> study. Harvard Health Publications explains a <a href="http://www.health.harvard.edu/blog/fall-back-from-daylight-savings-time-may-be-good-for-the-heart-201111043760">possible reason for this effect</a>: <blockquote>Sleep is the presumed link between these twice-a-year heart attack trends. The hour of sleep gained or lost is layered on what many sleep experts consider a baseline of sleep deprivation.</blockquote>

  • It's Good To Be Born In Autumn

    It's good to be an autumn baby! Research from University of Chicago scientists found that people<a href="http://www.newscientist.com/article/dn22054-autumn-babies-more-likely-to-hit-100.html"> born in the autumn months</a> have a higher chance of living to age 100, the <em>New Scientist</em> reported. That study included 1,500 centenarians born between 1880 and 1895. "It was found that months of birth have significant long-lasting effect on survival to age 100: siblings <a href="http://www.hindawi.com/journals/jar/2011/104616/">born in September–November</a> have higher odds to become centenarians compared to siblings born in March," the researchers wrote in the <em>Journal of Aging Research</em> study. The researchers hypothesized that seasonal infections (with long-lasting effects) might play a part in the <a href="http://www.newscientist.com/article/dn22054-autumn-babies-more-likely-to-hit-100.html">difference in longevity</a>, according to the <em>New Scientist</em>.

  • An Excuse To Warm Up With A Hot Beverage

    There's nothing quite like enjoying a warm beverage indoors when the evenings start to get chilly. Fortunately, a lot of our favorite warm drinks -- like green tea, black tea and coffee -- are loaded with nutrients. <a href="http://www.huffingtonpost.com/2011/10/24/five-warm-drinks-health-coffee-tea-cider-chocolate_n_1025772.html#slide=425689">Green tea</a>, for example, is high in antioxidant polyphenols which are able to help our bodies fight against the cell-damaging free radicals acquired through the environment. And <a href="http://www.huffingtonpost.com/2011/10/24/five-warm-drinks-health-coffee-tea-cider-chocolate_n_1025772.html#slide=425769">coffee</a>, which also contains antioxidants, has been shown in several studies to lower the risk of some cancers. For more health benefits (and possible pitfalls) of some favorite warm fall drinks, <a href="http://www.huffingtonpost.com/2011/10/24/five-warm-drinks-health-coffee-tea-cider-chocolate_n_1025772.html">click here</a>.

  • Get Back In The Habit

    For people in school (or people who have <em>kids</em> who are in school), fall marks the start of a set routine -- which is a good thing for our health, if we let it be. For example, waking up and going to bed at the same time every day promotes healthy sleep, Hagen says. But it's important to make sure we prioritize what we build into our routines. "There is a rhythm to the day -- make sure that 'face time' with kids [and] family are part of the rhythm," he says. Best way to do this? Activities like having supper as a family, and <em>not</em> screen-based activities (like sitting in front of the TV or computer), Hagen adds.

  • What Skin Care to Use For Fall

    Do you change your face lotion for autumn? NYC women reveal their moisturizing secrets