The level of your male partners arousal, usually measured on a scale of 1 to 10. One being the lowest, in other words, flacid/limp. and ten being the highest.
Hopefully, in ordinary day to day situations i.e shopping, washing the car or walking to the pub, your bloke is hopefully rated as a one, but as things start to heat up in the bedroom department, he increases to a (rather stonking) ten.....WOO-HOO!!
Usually, a good shagging can start to take place at around a level 7-8, as the penis will carry on swelling while you bonk away!!!
To find the level off your partners penisocity, either have a cheeky feel, or ask him what level of penisocity he is at!!!