I will attempt to diagram what I think is likely a common attitude towards sex/dating/relationships from the viewpoint of the lesser-socialized geek (usually male) who doesn't consider themselves particularly attractive.
Desire: a long-term(?), stable, relationship, definitely with sex, and quite possibly low-maintainence (or scheduled-maintainence, as one does to a car in good working order (flowers == oil change?) rather than having to perform unscheduled/catastrophic maintainence (flat tires == sudden insecurities?) often). Does not like rejection. Is accustomed to rejection. Often has difficulty decoding the subtle signs that say "I am interested, please ask me out" unless the target explicitly says same. Would prefer to find someone quickly, without having to endure hideously uncomfortable one-on-one social situations only to find that they are not a prospect for anything more than same hideously uncomfortable one-on-one situations, or group time.
Failing that, wants to get laid. Desires: someone genuinely interested in them and their interests, with possibility for a friendship/relationship. Expects/dreads: someone who just wants to get laid and will insult them or deny having slept with them afterwards.