My first long term boyfriend loved period sex. I was only 15, we were together til I was 20. With this sort of early liberating training, and lack of shame about it, well, if a guy is repulsed by the thought of period sex, I know he’s the one with the problem and it likely isn’t really gonna work out. Not that I am like “oh, I’m on my period, let’s have sex.” In fact I prefer to not on the heaviest day.