Know this is an old topic now but feel the need to have a small rant, so here goes:
If you send me a nod I'll send one back because I'm being polite and friendly just saying 'hello', cos generally 99.9% of the time I'm a nice lass. It DOES NOT mean I want to get inside your leathers. Do you stop every female biker who nods at you on the road and hand out your details??? Didn't think so. So please don't act all offended and send stroppy and rude messages when I tell you that I don't want you mobile number or your msn contact, just because we nodded at each other.
There rant over, I feel better now