They're divided into gender because we've met several people who are uncomfortable discussing the subject with the opposite sex. They've told us themselves, so pardon that we've thought not to make them more uncomfortable than necessary.
Additionally, we're not educating about identity or sexual orientation. I, as a woman, want to educate other women about their bodies as I have been made aware that some other women in our company aren't even sure what or where their clitoris is located. Nor did some of them know what went into preventing pregnancies. This is information I have explicitly learned hasn't been shared with people.
The intent isn't to make anyone feel unwelcome, and I'm sorry it upset you so, but you have made assumptions yourself by thinking we were responding out of our own arrogance.