well, never did it, but had tooo many chances. I've got even kinda problem with it - if I met just any friend of mine which I know well more than 2+ years and he is with his girlfriend together, she looks at me like she wants to strip me right there and suck it all the time. as the time flows, everything is ready to get started =) but I can't let it happen. unless sex in 3 persons to gangbang her lol
