Which of the following is the worst explanation for not wanting to have sex?

Explanation

Endorphins are stronger than morphine and are released during sexual intercourse. They have a pain releaving effect on e.g. head-aches and can also treat mild depression. Sexual activity can also leave a sense of euphoria in the body and release the tension, which blocks the blood flow to the brain. Last, but not least, sex is a natural antihistamine and can help against a blocked nose or treating asthma or hay fever.