That's silly.
Anal play does not equal gay. Like not at all. Straight men have a prostate too, they can enjoy having it massaged and played with. A woman can do that with fingers, butt plugs, stap-ons, and various other sex toys.
Wanting something in your butt does not make a man gay. It's the gender of who puts the thing in that determines sexuality.
And that's probably why we have futanari porn/hentai (woman with a penis). Yeah, skin might feel better, but a straight man wouldn't enjoy the rest of the "package". Like, I'm not saying there's anything wrong with being gay or bi and like having a real cock in your arse (why else would I be in this site lol?). But a straight man just wouldn't want to have a man in him. A straight man is attracted to women and wants to be with them. And the way he wants to be with her might be her fucking him silly with a strap-on. Still doesn't change the fact that he's with a woman. ٩(๑❛ᴗ❛๑)۶
Yup, the only way I see it could happen that the guy dumps a girl to go look for a guy is when he already had some doubts about his sexuality and would reeeeeeally want to deepen the knowledge about this newly discovered side, if you know what I mean (=・ω・=) but that would probably be only momentary and once he would settle with his new self, he would probably regret dumping the girl, you know, because of the emotional attachment
double ended dildo XD could this be any better :) and by the way if one dau my BF asked me to do him, i will jump him without a second thought XD