Twins

# 13
An ugly woman walks into a mall with two kids.
A man comments "Nice Kids, are they twins?
woman quips" what the hell don't you see the difference -one is 9 years and another 7 years of age"
" Why did you think they are twins, are you blind or stupid"?
Man replied-Madam, I am neither blind nor stupid.
I can't figure out how someone would f**k you twice.