I live in London and I am outcall only, and I use public transport 90% of the time. So I am on th tube more than an average person, and I must say there were times when I got off a train when there was a dodgy looking guy acting nervous and looking around. But what can I do? This is where I live, where I earn my money, where all the friends are... Driving myself is also not an option in London for me. So all I can do is to hope for the best.