I'm with you Lordfrontpaw. Whoever thought of this has very little understanding of teenagers, as an inexperienced and awkward teenager I would have been mortified at the prospect having to play what is in effect a hen party game with my classmates.
Can you imagine? From what I can see all this does in give more ammunition for the gobby 'banter boys' to harass the girls and 'weaker' boys, stigmatises children who are not sexually active and puts teachers in a really difficult position.
Teenagers always believe that everyone is more sexually experienced than them, schools should be teaching them sexual health and boundaries and let them learn this kind of thing at their own pace.