I'll let you know the answer. For now, this is probably what I will be copy/pasting to the players:
"We are a children's/family game where young children play. Please
keep adult content off game. This is considered adult content as we
do not allow dating on this game. Such content is not appropriate
here. No other person needs to know what another persons personal
preference is or is not. We do not support "causes or real life
issues" on this game, please keep such content off game."
It's against the rules to have adult content, to date and to proselytize on this game. So...
We can remind players that LBGT is not a gender, it's a preferece. We do not allow dating, so no reason for others to know this info. We do not allow proselytizing either so please keep it off game. And we do not allow adult content.
Also updated is a bit regarding this in Detailed Rules under Dating. #4.