I've cum inside a lot of strangers (30M)

I used to cum inside a lot of women during one night stands, I imagine just of them were on the pill but I wonder if any of them actually got pregnant. One time we both left the bar and fucked in my car, didn't even exchange names. Another time I think an older woman was trying to use me as a sperm donor after the club. Another time a woman said "my husband would love for me to fuck you" and she did. In these instances we never exchanged numbers or contact information, it was always at the club or bar. All this is about 10 years ago now and I've been blessed to have clean STD results. As a 6'1 in shape black guy I do wonder if it was a fetish or being used as a free sperm donor.