There is an association between low BMI and loss of libido, sexual anxiety and sexual relationships. These findings are consistent with the explanation that low body weight impairs the physiological functioning of sexual organs.
We all labour under the sad misconceptions of "romantic love." The implication is that we ought to "live happily ever after," but that's just not realistic. Or healthy. Cheerfully accept your partner's limitations and your own. Don't expect that one person to meet all your needs.
What does intimacy mean to you? Sexual intimacy is probably the most stereotypical and most familiar definition of the word in modern society. But most people want more than just the act of sex -- they want some depth.