After graduation you get 10 days of leave, starting after graduation. You can mingle with as many ladies as you want. Once your at MCT you will be segregated again, to help you keep your focus. At MCT you will be far away from anything that resembles civilization, it's a little tiny area desinged for infantry training and no frills. There will be no ladies there, but if your good you can hump Mt Motherfucker.
If your MOS is not combat there will likely be a couple girls in that training unit. I've heard some of them called Amtrack before, so be careful. At my tech school there were some WMs (women marines) in the baracks next to ours. Most of them had 5 or 6 Marine boyfriends and it was common to see fights in front of the girls rooms to see who had the right to go inside.
My advice, forget about girls for a while, and focus on being a Marine, you'll have plenty of time later in life to let a women fuck up your life, you might as well make something of it for her to ruin.