What is a groin cup?

Answer 1

Testicles are unprotected and vulnerable in their placement outside the body (unlike other vital organs, such as women's ovaries) - and also testicles are easily the mostsensitive parts of the body. Therefore, males are advised to wear a groin cup which is formed to cover the genitals to protect them from impact. Groin cups are worn in an athletic supporter made to hold the cup around these sensitive parts.

Women also have something similar now that is sometimes called a groin cup, but because a woman does not have anything to "cup" over, they are more like shields/pads that protect her groin, which is sensitive, but is extremely difficult to injure because it does not have reproductive organs hanging from it.