This may sound like a dumb question and if its been asked before,please forgive.
Do females "hump" things?
Lily is nine months old and has started humping my DH's arm!

Is this normal? I know that it has to be a dominance thing,but is it normal?
Do females do this as well?
(she also squats and lifts her leg to pee! )

Maybe I just have a weird one!

Thanks in advance!