If you expected me to tell you that the media exaggerates the amount of sex going on between female inmates, I'm dreadfully sorry to disappoint you (or make your day, depending). It wasn't my thing personally, but I saw plenty of it. Although it's practically ubiquitous, it's not exactly the steamy romps in the showers you see on TV or more, ahem, low-budget productions.
First you case the joint for a private place (usually a broom closet or a bathroom -- they're not like public restrooms with stalls; we get to poop in peace in minimum security), recruit a lookout, then memorize the guards' routines to the point that you could do the job yourself if only they could see past that pesky "technically imprisoned here" thing. The girls learn to "prime themselves," so to speak, just prior to the intricately planned encounter, because you've got about five minutes, tops, to get the job done. There's little romance involved, no chance of getting fully naked, and you certainly never do it out in the open, so any idle fantasies of slow, sensuous shower orgies are relegated to Cinemax at 2 a.m. Besides, we have private showers, anyway. All this secrecy is necessary because getting caught might mean a trip to maximum security.