The little dent in the chin that catches excess sperm while being on the receiving side of the ejaculator:
evolution's way of letting us know it’s an ally of the
LGBTQ+, with a special focus on
homosexual activities.
"When Joey gets an unsuspected spray of sperm from a
trick, he can rest
easy knowing that due to his JIZZ CUP-CATCHER CHIN, the
mess will be less."