Asking "what gender are the players that you've helped" makes me dubious about this entire exercise and what you are trying to write about.

You're either starting from a flawed premise – that people will check the real-world gender of a player before assisting them, and the other person will give that information – or you're actually after the gender of the character of the player they're helping, and/or you intend to write an essay about whether people only help players they're attracted to (in which case you've asked the wrong questions anyway) or only help people of the same/opposite gender to them.

Also, you're never going to get a properly random sample by posting on a forum for volunteers – much less when you expect them to publicly post personal information.

Whatever you're aiming for, you're going to get an unrepresentative answer – if you get anything beyond a lot of shrugs and "I just help people without paying attention to gender" responses.