Venus and Mars in the 2nd house for instance would give emphasis on material goods and assets. It all depends where it is. If these planets do not aspect the 5th house and the 7th in some way or rule them, then relationships may not be a huge focus. If Saturn challenges then even more likely to have problems and pain.This combination is classically Intense charm (Venus) With Seduction (Mars) so natives tend to be provocative without even trying. Since you have a conjunct (same goes with hard aspects) you confuse Love with Lust & Friendship with Passion. That could be the reason you think you're just friendly while others pick a different message altogether.
Venus-Mars contacts tend to wild & lack 'social charm' as per say (some people already mentioned that earlier) as they really want to just do their own thing (Mars) but that depends on the signs they are present in.
Sex drives I personally feel are regulated by the signs & can't be confined to a single aspect but it does make a person romantically 'adventurous'. They tend to get into love triangles frequently just for fun. Venus in Pisces would tend to fall in love quicker than anyone else anyways with all the need for romance & glamor it's associated with.
Perhaps there is an element of bisexuality now that you've mentioned it but I haven't come across any exact documentation. Bisexuality is conferred from Air signs & Dual signs. (Gemini, Libra, Aquarius + Pisces). Uranus contacts can ofcourse work that as well, especially with aspects to Venus/Moon as unconventional relationships. Moon itself is important as well, in dual/air signs it can give tendency towards bisexuality.
Love & sex tend to go together with this conj, one won't be complete without the other!