Don't worry so much about terminology. I am not concerned about whether or not you are a sub or a slave, but that you are concerned about your self-control.

A few questions;

You say that you are feeling that it is a problem, are you finding that it is interfering with life? Causing problems at work? Social problems? (other than the issues with your husband).

How were you before this started? Sex drive is one of those things which is difficult to quantify, as it is very personal based on individual perception. Is it plausible that this is a case that you are finally feeling sexual and aren't used to it?

Roughly how old are you? Pre-menopausal women frequently have increased sex drive. If you are in that age range, this may not be related to the relationship at all.