It means he wants to make out with u
Run away.
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if you have sex with it, touch it, or humps your leg
You are having an orgasm.
I have a pain in my right butt an my right leg by my calf when i get the pain in my butt my leg hurts at the same time
The boy likes or is trying to get your attention. Or he wants to kiss her or tell her he loves her,
That means that the boy really likes her.
Yes
It means different things, depending on the relationship. You did not mention what the boy is to you.
Im sure you mean why do boy dogs lift a leg and girl dogs don't. Well, the answer would be because if boy dogs tried to "go" without lifting their leg up they would just end up peeing on their leg. and somehow they know that they dont want that.
unless the tail is wet, that could be fine. its just the way his/her butt is
it means he likes you and wants u to be close to him