Nature!

Riddle: There's a man and a woman who decide they need to do something. What they need to is very natural. What is it they need to do?

Answer: Take a shower.

Source: https://www.riddles.com/7350

There's a man and a woman who decide they need to do something. What they need to is very natural. What is it they need to do? — Nature! by bubble139 v1.

Riddle: There's a man and a woman who decide they need to do something. What they need to is very natural. What is it they need to do? Answer: Take a shower. — by bubble139 v2.