Everyone is teased about their name. I am really wondering why - if you are in your late 20s - you haven't lightened up about this yet? It makes me suspect you are extremely serious. Maybe just rolling your eyes when someone says this, and saying something like "yeah, I never heard THAT before" would help you.
For the record, my maiden name was also slang for a male body part, and I was teased... a LOT. I lived through it, and Gina is a pretty name. (And I like your screen name, too.)
Relax... I'll need some information first. Just the basic facts - can you show me where it hurts?