THe first story is about an office worker who likes to crossdress after work and go to a gay bar, he likes to be looked at by men. He especially likes one of his coworkers gaze.
second:
A horny student is looking for someone who can make him feel good, he eventually falls for his teacher who is also gay.
last:
A straight playboy guy accidentally meets his childhood friend at a gathering, figures out that he is gay and asks him to take him to a gay bar and eventually to teach him sexual intercourse between men.
Shisen no Toriko