I've read that some women subconsciously become overweight because they don't want to be desired just for their bodies or conversely because they don't want to be rejected for their personalities

I can relate to this on somewhat of a personal level. Though I would not gain weight to avoid sex. (5'7 and average 116 -118 lbs)But I do dress frumpy at times wear my hair pulled back in a pony tail that is not all that attractive (40 and a pony tail) I have even chopped my hair off shorter then a boys within this last year. I seldom wear makeup anymore. Not to avoid sex but to know my H's love is based on my person not my looks. I want someone to love me for reasons that run deeper then my skin and hair and eyes. I want him to look at the real me. I am very confident of my sexuality and sensuality always have been but have also endured relationships and experiences that have been based on the superficial aspects. So I tend to be worry more in that line.
I will admit that in the last year of just sitting around alot my stomach muscles have weakened and my skin has became a little loose across the stomach. Though I will still walk around the house vertually naked I am not as quick to wear a midriff out in public. I know my H will over look the pouch and feast on the skin exposure but I am not wanting to look like a 40 year old trying to be a 20 year old wanna be to the public. Shame to can not show of my dazzeling display of skin and Belly Button Rings anymore.

Now my H has a weight problem and though I have commented on it in the past never has it affected my desire level with him. I seldom really look at my H. It may take me days to realize he had a haircut and weeks to realize he lost or gained 10 lbs I am not that interested in what he looks like I am more interested in what he acts like.(not just him I seldom notice any males attractiveness when I do it actually startles me). But I do know that his own weight does not affect his sexuality but does affect his self confidence in other areas.

I like the open forum generalized question idea Lil.