I used to have this problem...
Until a mate sugested I fold it in half as 8 inches is less of a problem to most girls
Even better I folded it again and now at 4 inches and a wad of cash never have a problem getting in
Love it! Reminds me of a limerick I found amusing in my school days.
A well-endowed chappie from Kent
Had a knob that's exceedingly bent.
With a great deal of trouble
He thumbed it in double
But instead of coming, he went.