When you dig deeper on the site for Animal Instincts Pet Condoms, like clicking on "learn how to talk to your pet about protection" the site reminds you that the only real way to fix the problem is to spay and neuter. The fact is, of the 6 to 8 million pets that land in shelters each year, barely half are adopted. The rest get euthanized.
"The SF SPCA spays and neuters all of our shelter animals and those at the San Francisco Department of Animal Care & Control. We provide free spay/neuter surgery for feral cats and discounts to local partner animal rescue groups. We offer competitively-priced surgeries for public clients wishing to spay and neuter their pets."
More on their clinic here