It’s a checkered history, but certainly the recent history has been pretty good about passive openness to variety.

This.

Before anyone starts bitching about SJWs and movements for inclusivity hurting their pretendy-funtimes without remembering that, ultimately, DnD is a game based around cooperation:

They can’t imagine anyone was born before them.

As I mentioned above, used-book stores nearly always have some or all of the volumes pretty cheap (paperbacks of individual volumes for around a dollar), and I’ve found them in thrift shops for a quarter.

I'm pretty sure it's actually possible -_- it can happen as a sympathetic reaction to their female partners breastfeeding (wtf right?) and excessive stimulation but it's not common. Keep trying though :P