Less about the actual mechanics of sex and more about IMMORTAL point-missing: Madness' song "House of Fun" - the only band I can think of who managed to immortalise the act of buying condoms...which seemed to escape the PC police but was only fractionally less blatant than the lyrics in "Relax"

Then there's their track about...well...have a look for yourself! - I still remember the expression on my friend's face when she first twigged about this one...