i've only been physical twice with this bi sexual girl i've been casually seeing for the last few weeks, but both times i've had troubles gaining and maintaining an erection. i find her attractive and a great kisser however it's always a little awkward when we hang out and she doesn't seem to be very experienced in terms of physically pleasuring a guy if you know what i mean. however, i'm a 22 year old with a very high sex drive and usually get erections even when they're unwanted. also because of this girl i've kind of lightly taken up smoking cigarettes (we work together and cigarette breaks are the only time when we can really chat at work). i imagine the cigarettes could cause this, but i don't smoke too heavily at all. thoughts?