If you are sitting on your ass (as in the normal definition of buttocks) when cycling, you are doing it wrong or you are riding a recumbent. Typically you sit

If you are sitting on your ass (as in the normal definition of buttocks) when cycling, you are doing it wrong or you are riding a recumbent. Typically you sit on the part in front of your hip, which also has its downsides as it is quite a delicate area where pressions on the wrong area could lead to issues.