Confront the guy on his own and tell him
that you heard sex noises coming from their flat during the day. You wouldn't want to be crass, but you were concerned because you usually only hear it at night between 11pm and 6pm and you only remember because it keeps you awake, so it really stood out when you heard orgasmic screaming on the kitchen floor at lunchtime. You know, because you're a concerned neighbour and everything.
( Grrrmachine the indifference engine, Tue 30 Jun 2009, 21:21, archived)

pffft

( moohalaa, Tue 30 Jun 2009, 21:23, archived)