I like the first story because it is realistic. That is, straight x gay. It is so alluring...

Isn't straight man x gay man or straight woman x gay woman the potentially problematic dynamic, because it's going to run into the same problems that a straight man x gay woman or straight woman x gay man dynamic traditionally did? You should know what I am talking about. That icky "I can cure your sexuality", almost conversion therapy levels of delusion angle. Meanwhile, if its between two historically straight people, you can rest assured that it was thoroughly voluntary on the part of everyone involved because everyone is experimenting. There is lesser potential for manipulation and sexual orientation-phobic red flags to happen here.