Yeah sure, I'm not debating the whole Serwe-is-everything bit. I just dont see how this scene is part of it.
Soldier didnt do any swirling, and he went to a knee so he could line up their genitals (he put her on her knees already). I've never gone about raping anyone, or seen or studied it, but it seems like he's just an excited dude getting laid. This guy is a peasent, probably only ever been with old whores with few teeth and sagging... everything. A breathless, giddy, and disorienting encounter is reasonable.