I'm an ex-mod, and if it was asked much more than once, they'll remove it to free up space or something. New guidelines that were laid down not so long ago before I relinquished the mod status if I remember correctly.
The ability to remove a question because it's "common" isn't an option for us mods so it must've been for another reason. Your question should've remained; it wasn't breaking any rules but you should contact an admin personally to get a more detailed answer.
We have made certain changes to Girlsaskguys recently. There are certain questions which are repeated that we are not allowing anymore. One of these is "how did you find gag". If you search this question you can find the answers you are looking for. Hope this helps.
Someone is screwing up, either the supermods or the admin. Many questions have been removed when they didn't violate any of the rules. I heard even a question about users' weight was removed. It's really unfair, and if it's the supermods who are deleting these questions then maybe we should reconsider having them or the admin should reevaluate some of the people they assigned that position.
It's a repeated, common question, yes with good fun, but probably didn't add much value to what the admins want of the website. It's best you send the admins a message about this if you are still unhappy about it. They have been quite strict with the repeated questions recently, but hopefully consistent across all users. Sorry that you are unhappy.