Dr. Drew Pinsky believes too much sex can be a bad thing... for pets.
Joining PETA's campaign to to combat animal homelessness, the "Celebrity Rehab" addiction specialist recently promoted sterilization as a powerful tool to combat the animal overpopulation crisis.
As Dr. Drew explains in the campaign's video spot, "Every year, millions of dogs and cats are born into a world that doesn't want them, and they end up in crowded animal shelters from which only about half of them are lucky enough to be adopted."
According to the Humane Society, an estimated three to four million dogs and cats are euthanized each year in the U.S. alone.
Beyond spay/neuter, PETA suggests choosing shelter adoption over purchasing pets from a store. It's best when considering adoption to recognize the long-term commitment of caring for an animal -- otherwise, the pet could end up right back in the shelter.
Check out the ad below of Dr. Drew with his dogs, Daisy and Lulu.
Check out past PETA ads below (WARNING: EXPLICIT CONTENT)
Fake snow falls as Kobe Kaige, Penthouse's former 'Pet of the Year' poses nude for a PETA anti-fur ad campaign in Melbourne in May 2008
PETA animal rights activists demonstrate naked and speared with banderillas against the EU cash support for bullfights in front of the EU Parliament's Headquarters in Brussels on October 9, 2008. AFP PHOTO JOHN THYS (Photo credit should read JOHN THYS/AFP/Getty Images)
Dutch model Natasja Vermeer (R) is pictured by Italian photographer Angelo Gigli while posing naked for animal rights campaign organized by The People for the Ethical Treatment of Animals, in downtown Rome, 10 December 2007. The campain titled, 'Be an angel for the animals, don't wear the fur.' is the latest anti-fur advert for animal rights group PETA. AFP PHOTO / Filippo MONTEFORTE (Photo credit should read FILIPPO MONTEFORTE/AFP/Getty Images)
In October 2007, actress Sophie Monk lies nearly nude in a bed of crimson chilli peppers for a PETA pro-vegetarian campaign: "Spice Up Your Life - Go Vegetarian"
Naked Australian model and singer Imogen
SYDNEY, AUSTRALIA: Naked Australian model and singer Imogen Bailey holds Reggie the rabbit during filming for an anti-fur campaign ad sponsored by the environmental group People for the Ethical Treatment of Animals (PETA) in Sydney, 25 March 2004. PETA is protesting the commercial use of rabbits - which are found in plague proportions across much of Australia - by the fur and felt industries. AFP PHOTO/Torsten BLACKWOOD (Photo credit should read TORSTEN BLACKWOOD/AFP/Getty Images)
Two nude Peta girls shower on a sidewalk
Two nude Peta girls shower on a sidewalk in Holllywood, California on March 22, 2011 in celebration of World Water Day to expose meat's alleged devastating impact on the planet. AFP PHOTO / GABRIEL BOUYS (Photo credit should read GABRIEL BOUYS/AFP/Getty Images)
Barcelona, SPAIN: About one hundred members of the People for the Ethical Treatment of Animals (PETA) and Anima Naturalis, lies down naked silently protest naked in Catalunya square, in center of Barcelona, 21 January 2007. AFP PHOTO/LLUIS GENE. (Photo credit should read LLUIS GENE/AFP/Getty Images)
All Dogs Go To Heaven
Italian television presenter Tamara Ecclestone poses with her dog Buster in a new poster ad for PETA that urges, 'Be an Angel for Animals. Animals Deserve Respect, Patience, and Understanding'.
Adam And Eve
Models Patrick Ribbsaeter and Avi Siwa hold a banner encouraging the closure of all zoos, promoted by the Ethical Treatment of Animals (PETA) at a studio in Bangkok in December 2006
Alicia Meyer Bares All In Lettuce
Alicia Meyer wears labels referring to cuts of meat in a photo shoot for PETA's pro-vegetarian ad campaign in August 2009
Playboy Bunnies For PETA
Playboy models Victoria Eisermann and Monica Harris pose in a bathtub to highlight the U.K.'s water consumption, during PETA World Water Day in London in March 2011
Tony Gonzalez and October
Atlanta Falcons' Tony Gonzalez and his wife October pose nude for PETA's anti-fur campaign in November 2009
Model Becomes Tiger
Malaysian model Amber Chia with body painted tiger stripes poses with a tag line for PETA Asia near Kuala Lumpur in October 2009
Pamela Anderson In China
Pamela Anderson poses topless in PETA's 'Give Fur the Cold Shoulder' anti-fur campaign. In Chinese, the ad reads "Cold shoulders are nothing compared to the pain they feel. Please don't wear fur"
Two half naked women, from the People for the Ethical Treatment of Animals (PETA) painted with Canadian flags, protest against seal slaughter outside the Canada Trade Office in Taipei on March 23, 2011. The protesters said the European Union and the US have banned seal products for years and hope Taiwan can do the same too. AFP PHOTO / Sam YEH (Photo credit should read SAM YEH/AFP/Getty Images)
Two members of the group People for the Ethical Treatment of Animals (PETA) stage a 'naked' protest outside the venue of the G20 summit in Seoul on November 9, 2010. AFP PHOTO/HOANG DINH Nam (Photo credit should read HOANG DINH NAM/AFP/Getty Images)
Animal Activists Encourage Vegetarianism
LONDON - AUGUST 17: Shoppers stop to look at a naked PETA member lying wrapped in cellophane and bloodied on large trays for Pro-Vegetarian demonstration in Covent Garden on August 17, 2006 in London, England. PETA EUROPE aims to demonstrate to shoppers that all animals are made of flesh and bone and feel pain and that eating meat is literally eating a corpse. (Photo by Gareth Cattermole/Getty Images)
PETA's Banned Superbowl Ad