I need to know. What is your basis that Drew is into men? Because the only clue we have is that e-mail in the end of the chapter, which, as everything with Hunter, I don't trust. All relationships that have been mentioned up to that point that Drew had, were with women (even in the teasers for the new chapter, they bring a woman home).
Your example doesn't really cut it, since Hunter had already given up on Drew and expected him to turn out gay. If Drew really had gender envy, he'd be wearing the panties, or if it was trying to trick himself into being aroused by women, he wouldn't have been masturbating.
You have to remember who you're dealing with. Two unscrupulous individuals, one using drugs to achieve his goals, the other deception.
I mean, you could be right, but I wouldn't bank on it. If you do turn out correct, good on you, but if you're too convinced of your assumption and it turns out wrong, you might end up too disappointed. Point is, don't get too attached to your theory. I've seen too many fandoms turn toxic because the writer followed the original plan instead of a "clearly superior" fan theory. If the phrase "they should have done that" ever comes up, the reply is always "no, no they shouldn't have", because in the end, it's the writer who knows the true motivations of each character.