As a nurse I have to tell the public that you need to practice safe sex, use condoms at all times and see your doctor on a regular basis.
Now, personally speaking I really really really hate condoms. I hate the feel of them and I hate the time they take getting on and basically everything about them.
Sex is a primal need and desire. If it wasn't then none of us would be here for sure. It is a scientific fact that women get more horny when they are ovulating because it increases their chances of getting pregnant. Personally speaking I love to feel Doc cum inside me, when he doesn't on the few off chances I don't feel right. I feel like something is missing. It's like sucking your way down on a blowpop and finding out there isn't any gum in the middle of it. I can't explain it really, it's anticlimactic for me even when he made me cum. It just isn't the same at all.
To the OP, I am guessing when you are really really wanting your man to seed you, it would be very logical to assume that you are probably ovulating.