Cowgirl is one of our faves, but probably on #3 on how often. Or most common positions are variations of missionary and doggy.
For our #1 missionary, I (man) almost always have my legs outside of her legs, which naturally forces movement that’s a little more like the Coital Alignment Technique and so my penis has to slide a little more up-and-down along her clit rather than a straight in and out. It also shortens the length of penetration slightly. And then I regularly am up more on my knees than laying flat and alternate between supporting my weight on my hands/forearms and being more upright and supporting myself on the top of our headboard. So our go-to position has sort of 3 variations of missionary within it. Wifey usually rubs her clit to cum or the position allows for using her favorite toy, the We-Vibe Melt, while we’re at it.
Our #2 position is a flattened or prone doggy/rear entry. She lies flat and I lay on top. I like that I get to press more deeply against her bum that way, where as with a hands-and-knees doggy most of my contact is with the back of her thighs, which is also great, but just less for us. Unless I have reason to hold off and wait, this position usually does me in and on my way within 2 minutes. By laying flat she has a lot more purchase and resistance to really move her hips around too, pushing back up against me, rolling them, or even rotating/shimmying. It’s another position that she really enjoys using her vibes (again, either the Melt or the Womanizer Pro40 works well in this position, too) as she has her weight and mine pressing down against the toy as she holds it under her. This is also our primary position for anal with a dildo in her vagina that I can control thrusting by reaching behind.
Beyond that, other positions that we engage regularly would be one that Lovehoney calls the Right Tangle, face-sitting/face-fucking, reverse cowgirl, 69, her ankles over my shoulders, and standing doggy.
Here’s a big directory of positions to explore, too: