Of men and motorbikes

What is it with come men and motorbikes? Why do they think that bikes are strictly part of the male domain? I was talking to some friends and saying how i've always wanted to ride a bike, when one of them asks me "Why"? And there is so much of pain in his eyes. As if I am spoiling something beautiful just for the fun of it. Like if a girl rides a bike, it will no longer be manly to do so. Why does it have to be manly? It is just a mode of transport, for God's sake.
Another objection is, it is not feminine to ride a bike. Girls should stick to "Activa", one of them says. That's what suits them.

Anyway, in a few years time, i think they'll all get used to it. I mean, i don't think there is anyone who thinks jeans have become less manly because girls wear them.