Surprised no ones mentioned sexercise, expensive if you haven't got a lady friend/wife/partner/significant other currently, although there are some good deals in Soho where you can book 2 ladies for an hour for £70-80, that or go **** a fatty on a friday night out in town, god bless them they try but this method is still expensive as you need to get suuuuuuuper drunk and the drink negates the sexersise so you'll have to go back for seconds when your sober.... Hope this helps