i also think most people are brought to feel that they should be ashamed and that sex is dirty, so we feel our instant reaction to this number should be "oh too many!"
in actual fact i know many people probably would like to have sex with any person they like - the desire is there, but not the guts to do it for fear of gossip - i also know many who regualarly have sex with a number of other people i.e, fcuk buddies, friends wot fcuk, etc etc and as long as it remains secret its fine.
its all about perception, not the person being chaste.
and besides we all know that those numbers are often a lie anyway, don't we...?