I'd add a few fun physiology facts that I've been thinking about for a while--
1) Growth-- if you've gained weight that might be part of it too. Erectile genital tissue doesn't have any fat in it, but the stuff around it does. If your body fat increases, your stuff appears to shrink, because more of it is inside.
2) Cramping-- uterine cramping for hormonally female people is mediated by prostaglandins and oxytocin. Oxytocin is produced at orgasm for men and women both (also during labor for women, same chemical). Prostaglandins are completely blocked by high doses of anti-inflammatory pain meds like ibuprofen and naproxen (advil and alieve). If you don't have a reason not to use anti-inflammatories, you might consider taking 600 or 800mg ibuprofen (3 or 4 over the counter tablets) a couple hours before you anticipate having sex. It might help.
3) Smell-- from what I've heard, its universal for trans guys on T. I suspect it's not as noticable as you think. Guys smell different from girls, and the testoserone is the reason why. But female hormones during development cause the part of the brain that registers smells to be larger. So a trans guy will probably notice his own smell way more than a cis guy would, even if they smell the same.
And douching? OMG no. There's nothing good about OTC douches. They're usually just scent and water, sometimes with some acetic acid. They make it way more likely for you to get infections, both harmless ones like yeast and Big Bad STIs like HIV. If you want to rebalance things for the internal genitalia, try a couple tablespoons of plain yogurt, or a prebiotic lubricant (luvena comes to mind, though it's super girly). If you must use acetic acid, use plain vinegar, 1-2 tsp (5-10mL) in 1-2 cups of distilled water.
And that's enough Saturday night health geekery, I think!