I used to post ads on Craigslist Casual Encounters and one response I received was from someone who claimed that she and her husband were looking to start a family but had run into issues due to his low fertility so they were looking for someone to donate sperm ... as nature intended.
Doing a little legwork revealed that it was likely an attempt to get me to sign up for an Adult Friend Finder clone, get a pic of my dick or waste my time, they were "borrowing" images from a couple who produce amateur cuckold porn, google "MILF Becca".
I'm not going to lie, there was a small part of me that was intrigued if it had been a legitimate offer. Yeah, I would have asked them to draft a legally binding document where the husband would acknowledge that he knew I was knocking up his wife because if they separated and it got messy, he could have said, "The kids aren't mine and I can prove it!" And as the bio-dad, guess who's one hook for child support?
I've accepted that I'm never going to become a father and being honest, it's something I don't really have a lot of interest in anyway but I have to admit, knowing that I had a couple kids is a nice thought. The fact that I would have gotten laid would have been gravy!