Reverse Cowgirl is a position that stimulates a person's G-spot/p-spot and also gives access to the clitoris or penis, opening up the possibility of additional manual stimulation. If the penetrating partner's arms are long enough to reach, they can provide stimulation - or the receiving partner can stimulate themselves as well.
Reverse Cowgirl also lends itself well to bringing sex toys into the bedroom. As the angle ensures a lot of open space around the receiving partner, any of your favorite sex toys, like penis strokers or vibrators, can easily fit into the action. A vibrator that's easy to hold in the palm, like the Satisfyer High Fly, can be a particularly fantastic addition. The receiver (or penetrating partner!) simply needs to hold the vibrator against the vulva for full stimulation. The wide shape of the vibe can ensure the pleasure continues - even while the movement of sex jostles both of your bodies.
The position can be used for vaginal and anal sex and is often used in porn because it provides a full-frontal view of the receiver. (This can make it a great fit for your own homemade movies as well!)
It's also an easy and accessible position for pregnant people.