For me it was during my first marriage. She had lots of issues that we tried to work through for years that caused her pain during penetration. (and it wasn't due to my size.) She was very open about sex so porn was fine with her and that's when I first saw a facial. It really turned me on and I thought this won't hurt her either. My fetish was born then!!!! Now that's where I always want to cum, except when I was trying for a baby of course!