Sperm test

A 70 year old man went for a Sperm Test. The Doctor gave him a bottle to collect sperm.

The next day, the man came with the empty bottle & said he tried with his left hand then right hand. Then his wife tried with her left hand & right hand. Then his daughter-in-law tried with both hands & mouth. Then the neighbor's wife & daughter tried the same way..but could not open the damn Bottle....!!
I don't send dirty jokes:p