Like Visvisus said, get perception high enough to display the win conditions. Any encounter with "DA" as a winning condition can be won by topping.
If you are confused on the specifics, my understanding is this:
- DA = End the encounter via anal sex as top
- SA = End the encounter via anal sex as bottom
- SO = End encounter as oral bottom
- W = Enemy HP = 0
- L = Your HP = 0
It's unlikely (I don't know if charisma effects this or how the numbers work exactly) that your encounters will end after one busted nut. You'll have to try and DA or SA multiple times. The Wereslut will automatically Knot you before the SA or SO condition triggers afaik