Well, I have had pleasurable groinal sensations by the oddest of things that I can only assume are because of spiking anxiety. I used to work with a machine that could mess you up pretty bad if you had your hand in the wrong place at the wrong time, and sometimes you had to have your hand there unless you wanted a disaster to happen, and I found out quite by accident that the moment I knew I must pull my hand back, I'd get a tingly feeling between my legs that wasn't unpleasant. Of course, I was intrigued and tested that, finding out I could consistently feel that sensation at will, by putting myself in that momentarily tense (and hand-threatening) situation. Not that I did it for the feels, far from it, but after years of moderating this forum & seeing people alternately question and assert that anxiety spikes can cause groinal sensations, well I was in fact rather gratified to experience it for myself, verify that it was real, and be able to reproduce the effect on demand, proving it wasn't coincidence or a one-off thing. As well as conclusively proving that it can be an anxiety that has absolutely nothing to do with sex. The thought of a broken or maimed hand is 100% not on my sex gratification radar, yet I got groinal sensations from an intense, compressed moment of time in which something bad could happen to me. Which had in fact previously had happened and I don't know how I didn't break my hand. After that, I began to notice the groinal sensation.
So yes, anxiety can cause pleasurable sensations in the nether regions and have zero connection to sexual desires. Been there done it and found I could call up that sensation every single time I placed myself in that anxious situation. I don't know, but I wouldn't be surprised if it has something to do with fight-or-flight instinct.
For me, a lot of the time OCD style intrusive thoughts are best gotten rid of by learning to not let them scare or worry you. I have harm OCD and I eventually learned to disregard my intrusive harm thoughts. That greatly decreased the frequency and intensity of my fears of harming others. When an intrusive harm thought pops into my head, I know I have to ignore it and take the attitude that I don't care about the thought. I call it deferring anxiety. I'll worry about the bad thing after I have done the bad thing, and not before.
I know it's harder when sexual sensations or sexual desires are involved. Sexually-intertwined OCD style fears are some of the hardest to rid oneself of, but OCD is OCD and what works in one OCD theme should work in others. Well a good example would be POCD. I've never allowed myself to worry that I will molest a child, even though I know my OCD would jump on that like a starving wolf if I gave it half a chance to do so. I very carefully keep myself from beginning to ruminate on such things and I make myself not worry about it, or overthink every time I affectionately touch a child- because by the time you let OCD get through with you, everything would be a 'bad touch'. Well, they're not, I'm not a pedo, and so I refuse by choice to entertain the notion that I'm a pervert.
Such things take practice and are very hard to get started, but once you keep at it, eventually you realise that what you obsess and worry over doesn't have the same hold on you as it did before. From my point of view, a person has to out-stubborn their OCD.