1. Did you see the dress she was wearing? I think I'd better go and take a cold shower!
2. After watching that steamy movie scene, John felt the need to take a cold shower to cool down.

The origin of the idiom "take a cold shower" is not specifically known, it is believed to have emerged as a colloquial expression in the early to mid-20th century, reflecting the notion of using a physically cold shower to reduce or suppress heightened sexual arousal. The phrase gained popularity as a humorous and lighthearted way to suggest that someone should find a way to control or redirect their sexual desires.