At a Biology class, the teacher asked the class:

'Why is that during childhood, gals tend to grow taller than guys ?'

A student replied: 'That's because guys have balls and that weighs them down.'

Teacher: 'Then why is that at maturity, guys tend to grow taller than gals ?'

Student: 'That's because gals have breasts and they are heavier than the guy's balls.'

well said...