^ yeah Dave has hit the nail on the head, no matter where you live, having the place to yourself at the time is the most desirable, but if you can't then it helps if the people you live with give you space. Some room-mates can be kryptonite for seduction. It's hard to say either way if you're living with parents/relatives as individual cases differ - some discourage it, some are indifferent, some encourage, others even try and get involved! Women are certainly less likely to be shy when they think there's nobody around, which can often equate to less inhibited sex.
Regarding the whole place vs. car thing, I say if you can afford a decent place to live and an OK car vs living with the 'rents and having a totally fancy car, go for the first option. In my opinion it shows more class to drive an older but good quality car that is well maintained and always clean and waxed. Things like Mercs, Saabs and BMWs always make a good impression if they're in top condition, even if they're 15 years old. Also finally I think generally society tends to respect a man who lives away from his parents - well, in Anglo cultures at least - and rates independent living over fancy car ownership.
