Is sexual incompatibility a sufficient reason for divorce?

There is no such thing as sexual compatibility. There are no to people that are completely in sync sexually. There is always some learning and compromising to do in a sexual relationship, or any relationship for that matter. So, don't go into a marriage with the false notion that you will be sexually compatible. It is just another aspect of the marriage that has to be worked on, at least to some degree. That being said there may be situations where it is just too much work, but think first before making a drastic decision such as parting over it: Did you try? Have you been open and honest with one another about it? If you really love each other, then there should be some willingness to make an effort to please each other and find some "sexual compatibility." If you cannot work it out together and counseling does not help either, then maybe think about the other route.