Threesome. Two girls or two guys, I don't really care. I'm not into dudes, but I am into exciting new sex. Plus, it's one fantasy of the girlfriend's... so I'd be down to help with that.
I actually have this weird fantasy of watching other guys bone my girlfriend. Call me weird, I know I am. But I think it would be kind of exciting to watch my girlfriend get gangbanged. Not really sure why either. A curiosity perhaps at how she responds to sleeping with other guys. The mix of both horror and sadness combined with sexual excitement and curiosity would, I think, do it for me.
*shrug*
I'm not really sexually frightened. I'm open to anything and everything short of shitting, pissing, and puking.... and mutilation...
My sex life with my girlfriend has pretty much covered all the... erm.... bases.
So yeah... really, I'm sexually content.