In Denmark we have a saying that annoyed me for a while. I dont know if other countries have the equivalent, but here it is translated:
"A lock that can be opened by many keys is a bad lock, but a key that can open many locks is a master-key!"
Of course, the locks and keys representing women and men, respectively.
I thought about it recently, and this is my conclusion:
A lock that is opened by many "keys", is really either being lock-picked, forced open or maybe it is indeed a bad lock.
And a "key" that opens many locks, is either a lock-pick or any key just opening bad locks.
After all, a good lock is designed to be opened by only one key, and vice versa