There's always the old Aquinas route. Channel it into your work, or get in the habit of prayer or meditation for relief from that aspect of yourself. If a medieval monk whose family did everything possible to provoke a carnal response out of him can find it in himself to get past them, so to can you. It's a mental thing to be sure, but it can be gotten past.

I'd recommend against any pharmaceutical intervention. Better living through chemistry aside, a mental habit of recentering and refocusing is much easier to undo later down the road than drug induced changes to physiology. And yes, those happen, no, they aren't necessarily either researched or monitored for.

If you're still dead set on the pill route, your best bet is a talk with a doctor of reproductive medicine, and they may be in for an ethical quandry.

Might be some old herbal remedies out there but most efforts of ye olde healers were ah, in the opposite direction.