I would say shounen ai for sure, but the ones I would recommend aren't short lol For example, 19 days and Komatta Toki Ni Wa Hoshi Ni Kike! or What lies at the end? reply
I think they would feel disgusted too if a stranger would suddenly grope them. And yaoi is not the greatest example because it's mostly a fantasy writen by a girl too. We need a guy to answer this lol reply
For me it was by watching Junjou Romantica in Youtube when I was 16. I mistook Misaki with a girl and I thought it was shoujo. So, it was a real shock for me, I didn't even know yaoi existed in general and I was super innocent even at that age. Anyways, at first I felt disgusted (I grew up in a quite homophibic family), but after that shock I became curious and kept watching. Now I only read yaoi lol.