Why is my body leaking semen so much. it happens when i am snuggling with my girlfriend, and it is enough that it makes my shorts damp. what can i do to prevent or lessen this? it is very embarrassing?

It is not semen which is only with ejaculation. I assume you talk about precum or urethral discharge from sexual excitement, I guess. It will be less by time when the excitement is less with repeated encounter. Good luck.

What is leaking is not semen but something commonly called- precum. This is a thin sticky secretion from the glands lining the genital tract when a male is sexually aroused. So it is normal. you can use paper or cloth material to cover the penis to absorb it