Do you know why boys can't ask girls out? Because they don't have any balls to ask girls out!
Lack of Balls
Explanation
Explain Bear
Listen up, buttercup. The joke is saying that boys are too scared to ask girls out. It's a play on words, see? Balls, like, courage, but also, well, you know... You probably don't know, you sweet summer child!
Anonymous
then why can girls ask boys out then ohh..