How is this discrimination? there is a benefit that you decide not to use, period. It's available to everyone who wants to use it and they will even cover all the expenses to be able to use it y you have trouble doing it naturally (adoption, insemination, surrogacy, etc.)
By your same logic any benefit is discrimination, I don't want to save in a 401k, so I should get the matching money anyway. I don't like the food that is given for free and I decide not to eat it and should get money instead. I don't go to the gym, so that paid gym benefit is discriminatory.
I can't believe the weird logic people get to use to complain about everything.