Hi there. I'm afraid I can't really help you here!

I am guessing that "marking" could mean a guy peeing on a woman, or a guy giving a love bite to a woman. In the animal world, a male may pee on the female as a mark of territory during sexual arousal. Sorry, I can't help you more than this though.

Remember, it's important to protect yourself from unplanned pregnancy and STIs if you become sexually active at some point in your life with another person. Take care.