How cute. n.n I really like the look both engies pull off, stylistically. They represent their respective teams really well. n_n I notice that the blue engie is also right handed while the red is left handed.
Seriously, though. I do know that it's a euphemistic reference to something sex/sexuality-related, but I cannot think of a sex position that resembles a "Y" shape. Or am I approaching this from the wrong angle?
Okay, I checked Wikipedia's "sexual positions" article for "scissor", and ultimately it appears that "Y" stands in for "scissoring-style tribadism". IMO, that's wrong - it should be "double Y", since there are TWO "Y"s in the resulting "shape".
That's why B3K said "someone will tell you when you're older". If you don't get it, it's because you obviously didn't experience it (nor ever seen it... wow, that's kinda strange I must say). But if you want to know, use your imagination. Plus, there's a HUGE hint if you look at the pic.
I don't see the hint, but following on DarkDan1100's reply, it appears that "Y" stands in for "scissoring-style tribadism". IMO, it's wrong - it should be "double Y", since there are TWO "Y"s in the resulting "shape".