I think if there is love and attraction between two people, the risk of true sexual incompatibility would be minimal! (Well, I could be wrong about this so I'm open to debate
)
Of course communication and experimentation are important in this! Obviously if you or your partner can't communicate your likes and dislikes, then there may be problems.
Sure, some people may be more sexually compatible from the get-go than others, but I think that most people who really do love and value their partner can eventually work it out!