When you are one of five siblings growing up in a cottage with thin walls, you learn to conduct certain scenarios with the rigour of a Trappist monk.
Try bringing a boyfriend home for the weekend when your little sister - 11 years your junior - has appointed herself Chief Inspector of the Sex Police. You learn to kiss without squelching and to get intimate so slowly, you might as well be doing Tai Chi. I can only presume that Gemma Wale, of Small Heath, Birmingham, never underwent that kind of close family scrutiny.
She has just been jailed for breaching the terms of her Asbo by making "loud sex noises" in the small hours of January 29. One irate neighbour said: "Gemma started screaming and shouting whilst having sex, which woke us up. This lasted 10 minutes."
Just the 10 minutes, then? It seems to me the woken sleepers were let off lightly. I once had a strapping young neighbour whose girlfriend had an orchestral range of appreciation and whose exploits ensured his headboard was hammering into our partition for half the night. The effects were so dampening to ardour on our side of the wall that we thought about abandoning the pursuit altogether and taking up crochet instead. For loud sex is not just disruptive, it's the cruellest form of bragging. The message transmitted to those close by is: "Our coming together is so beautiful and ecstatic, it transcends your claim to dreary old sleep."
No erotic vocalisation is as unkind, or long-remembered, as that suffered during undergraduate days - and no audience as vulnerable as the hormonal mass of virgins for whom sexual fulfilment is yet as mythical as Atlantis.