I think it's just that gay sexuality is much lower-key in comics than straight - like, in Runaways, the straight couples were always making out or making sexual references, but it took aaaages for the lesbian couple to get so much as an on-panel kiss. And Cassie has kissed several guys, but Billy and Teddy have never kissed on-panel. Wasn't there a running joke that Deadpool had kissed more guys than all Marvel's gay males put together? (This was before the Ric/Shatterstar kiss)