Can't really tell you what the menu is, but I can tell you how to get the "rape" scenes and what the basic controls are.
I'm sure you've figured out arrow keys to move. A is weak attack, S is medium, D is strong, Q is grab, and W is counter (E brings up that confusing moves menu which is absolutely useless to a non-Japanese speaker). You can hold W down for a second to charge up counter, and if it's not used will go off in an attack in about two seconds. Yes I know that's confusing, just play with it and you'll see what I'm talking about.
Ok, now for the other stuff. I haven't played with all of the characters but I'm 99% sure you can only do the rape scenes with males, and maybe with the one specific guy with the spiky hair from the previous games (which is really disappointing considering there's a tentacle succubus chick). So pick him, and let's get down to it.
In the bottom left are two charge bars. The bottom one is just a straight bar with two sections. That charges by hitting or being hit. The only Super I know that uses that one for the character that I mentioned is down, forward, down, forward, attack. It does a power punch. Hard to hit with but decent damage.
Anyway, the other bar above it is the word STRIP. That bar is harder to charge as it only charges when A, you take a heavy hit or B, you hit someone with a counter (yes that includes the little two second charge attack thingy). On the last round you fight a character (meaning she's already lost once, if you have or not doesn't matter) you have to finish them with a STRIP combo to get the scene. That's Down, Forward, Down, Forward, Grab (W). They can block it, it doesn't work if they're still completely on the ground when you do it (though it can work when they're getting up), and yes missing does still drain the STRIP bar. Yes this an annoying tedious mechanic, but with a little practice it's not TERRIBLY hard.
But wait, there's more. Now the other character is laying on the ground with their clothes in tatters. To actually initiate the rape sequence, hit down, back, weak attack (A). Your character will jump down and start pummeling the downed foe. While this is happening press strong attack (D). This will start the raping. Pressing D again cycles through one of four positions, A speeds up the pace, and S finishes. That doesn't end the match though, you can continue doing it as many times as you want. Since the enemy's health regens in this mode the fact that you start pummeling her to initiate this doesn't matter.
Once you get bored of that and want to fight the next person, notice that both your combo bars stay full now. Use the strip combo again (Down, Forward, Down Forward, Grab (W)) to finish the match and go on to the next.
Hope that helps. More of those studio S fighting games have a pain in the butt supers mechanic as well. Let me know if you need help with the others.