I don't think she should have to do something she finds unpleasant, in order to get any orgasms at all, when he's already having orgasms from penetration.
If a woman can only receive orgasm from oral, it's fair for her to receive but not give oral sex, as long as she makes him orgasm somehow (such as by penetration, the most efficient way to make a man orgasm, whereas receiving oral is the most effective way to make a woman orgasm).

by the way I'm not saying anybody is obligated to do anything they don't want to do; the question is simply about fairness.
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