Some of you may be amused by this:
I asked my boyfriend about morning wood, because frankly, it baffles me.
Shewolf: I just don't get it, why does it do that?
Shewolf's Boyfriend: Look biology-chick, you of all people should understand it.
SW: Well I don't! Like he just wakes up, ready for action...
BF: I don't know, it just happens.
SW: Is he really optimistic about his day? He wakes up thinking 'today, I'm gonna fuck somebody'
At that point, he got out of bed.