Indeed you're right it's not the optimal time for sexual fulfillment for women. Generally speaking ovulation would be the time that a woman most desires sex and finds enjoyment in it. And wouldn't ya know that's precisely the thing that the Pill suppresses! 

And don't play the "you just equated contraception to nuclear war!" card. It's the use of an extreme example to drive home an reasonable principle. Here's a more palatable example: the "white lie". The person who thinks intention is the dominant factor in moral action would say that a white lie is morally fine because your intention is to spare someone's feelings or make them feel good. Solid intention but doesn't change the nature of the moral act which is speaking falsehood. If I ask my wife if I look stupid with a particular shirt on and I objectively do look stupid and she tells me I don't, her desire to spare my feelings doesn't change the fact that she lied and I am going out in public looking stupid. Same logic as before.