Nobody turns into anything, people are not caterpillars. That's the incorrect phrasing.
A better way of putting it is, can one make a man who predominantly has only slept with women have a change of mind and sleep willingly with another man? The answer is yes. Resoundingly.
Not all "straight" men can be seduced, and obviously not all "gay" men can seduce. Every door has a key.
It might be difficult to imagine if your personal experience has taught you otherwise, but yours is not necessarily the only way.
I've seduced hundreds of "straight" men as a femme man in my 20s. I can still convince some straight men to swing my way in my 30s but it is increasingly difficult with age to do so with charm and body alone.
Just enjoy the story if you like and move on.
@LiamCox thanks for sharing. Cheers.