Disagreed. If that is the only sex life B has then intimacy between the two rapdily dwindles to a shadow of what it should be.
If the intent of both A and B is to achieve their respective levels of excitement, and both A and B are in natural agreement that it's a good thing (i.e. one does not coerce the other) and both A and B agree either of them can call the new arrangement off if something unforeseen happens that threatens to destroy what exists between them... then...
...go for it...
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