So if you've been on reta for a few months and your sex drive has basically disappeared, you're honestly not alone,It happened to me. it's way more common than people admit and nobody really talks about it. There's usually a few things stacking up at once. Your body just isn't that into sex when it's running on a sustained calorie deficit, especially if you're cutting fast, and on top of that the nausea and general GI weirdness these drugs cause doesn't exactly put you in the mood either. The bigger issue for a lot of people is hormonal though, losing fat quickly can mess with your estrogen and testosterone since fat tissue actually produces hormones, so dropping it fast can tank your levels more than you'd expect. Add in low iron, B12 or zinc which are all super common when you're cutting hard, plus the general fatigue, stress and mood stuff that comes with the meds, and it's a lot working against you at once.
What's actually helped people (and me) is getting real bloodwork done instead of guessing, ask for estradiol, total and free testosterone, SHBG, prolactin, thyroid panel, ferritin, vitamin D and B12, that'll tell you way more than any supplement will. If you're losing weight really aggressively it might genuinely be worth slowing the cut down a bit, and don't skimp on fat in your diet either since it's literally what your body uses to make sex hormones. Sleep and stress matter more than people give them credit for too, cortisol staying high basically competes with your sex hormone production. Lifting weights instead of just doing cardio also seems to help keep things more balanced hormonally. And honestly just talking to your partner and taking the pressure off helps more than any of this stuff on the physical side.
On supplements, worth mentioning zinc since it's commonly low in people cutting hard and plays a role in testosterone production, vitamin D if you're deficient (which a lot of people are without knowing it), maca root which has some actual research behind it for libido even if the effect is modest, and omega-3s which help more indirectly with hormone production and energy overall. Just get tested before you start supplementing blindly, no point taking zinc if your levels are already fine.
If you're on some kind of medical protocol already, genuinely just bring this up with whoever's supervising it, adjusting the pace of the cut or fixing an actual deficiency usually does more than anything you can buy over the counter.