A previous anonymous comment to a posting said that “whatever it is, it’s sex.” Well, actually, no; I don’t think so. I do agree, though, that sex is perhaps the most highly charged component in relationships.
In general, I can imagine boxes that hold stuff about my relationships together, physical sex and attraction being one of them. There are undoubtedly scores of little compartments within that box.
To move from generalities to the specific, I am really talking about my own relationships. Yes, sex is important and highly engaging and consuming. It can generate the strongest of emotions (and most bodies respond to what feels good, regardless of the giver). The attraction for me, however, is not merely physical for I find that people in my life quickly become more or less attractive as I get to know their personalities.
I figure that most humans are probably not 100% straight or 100% gay, but that we likely fall somewhere along a moving continuum. That’s because relationships and attractions are only partly informed by physical sex.
There is another box of pertinent stuff that informs my desire to share life with another person.