Bloop bloop I don't know whether to laugh or to cry. Regular cycles are not as common as you may think, and lots of things can throw a cycle off. Both partners disciplined- seriously, when there are guys out there who don't even want to wear condoms, you think they will be part of a disciplined couple? And the testing? How often? I don't think my provincial health care would be very helpful on that, and you already know from comments here about the American system.
Seriously, if you and a girlfriend were planning to have sex, do you really think she would do all that monitoring? And trust you to hold off during her (theoretical) fertile time, And a few days either side just in case? Hypothetical me in that hypothetical situation would be on the pill or an IUD or condom+cervical cap+spermicidal jelly.
Sorry about the semi-rant, got a little distracted there.
I will tell you something that may not be as true today as it was then. When reliable birth control became available for women, we grabbed it, because we were the ones who got pregnant when our partners were irresponsible, or the condom slipped, or we ovulated early/late.