It's fifth time lucky for most new couples.

you are seeing a new girl for the fifth time tonight don't forget your toothbrush – because chances are you'll end up in bed together.

Four out of five girls think it's acceptable to have sex on the fifth date with a man.

A third will throw away the rule book and have sex with someone on the first date but five per cent will wait at least 12 months before jumping into bed... at least according to Ann Summers.