Disgust can be not only with food, but also with sex. There are many people who find sex both desirable and disgusting. They generally consider sex to be an animal instinct. This may be due to upbringing, religion, aversion to bodily fluids, trauma, not accepting the other, rejecting oneself, etc.
If one of these is true for you and you want to solve it, make sure you contact a professional!
General disgust should not be confused with disgust at certain forms of physicality. If you basically enjoy sex, but refuse to comply with some extreme request from your partner, it may not be your fault. Doing something out of force, whether it be a compulsion to comply or a threat to leave, is certainly not recommended..
