Pretty interesting how the new show "Coupling" is regarded to be extremely raunchy and "pushing the envelope," when Friends, especially in its early years, had some pretty raunchy lines itself, with tremendous sexual innuendo. In the beginning, at that time, I think it pushed the envelope on what you could see at 8:00pm.
Raunchiest Friends lines I remember: Ep 215 (TOW Ross and Rachel--You Know) When R&R were making out in the planetarium: Rachel: Oh God! Ross, it's OK, it's OK. Ross: What? Oh, no no no, you just rolled over the juice box. Rachel: Thank God!
Ep 113 (TOW The Boobies) After Chandler accidentally saw Rachel's breasts: Ross: If you saw her boobies, she gets to see your pee-pee. Chandler: You know, I don't see that happening. Rachel: That's right! Tit for tat! Chandler: Well, I'm not showing you my "tat."
Ep 219 (TOW Eddie Won't Go) Rachel: How can I grow if you don't let me blow? (referring to the wind) Ross: (confused) I, uh--well, you know I let you do that.
There are many more than that, but that's just a sample. "Coupling" is probably just Friends to a greater extreme.
-Frank