I think that it's, mostly,a gender based thing.Men,usually,awake with an erection.It rubs on the bedclothes and makes them horny!
Women, usually,worry about getting breakfast,getting the kids
out,etc.
Men are concerned with those things too,but have that physical
stimulus to remove,first! Irish

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Irish---Better to be dead & cool,then alive & uncool!
(Harley Davidson & the Marlboro Man)