haha, no argument. just opinionated.
If you have any questions feel free to let me know.
I love sharing this information with others.
Thers no secret position to make a girl cum but yes,
from behind works best because its the most direct penetration to the g spot.
either doggie her legs closed, yours spread out (rather than hers spread out yours inside her legs) or reverse cowgirl modified to where shes not riding but shes sitting on top and your just pounding away-THAT is a powerful direct gspot stim position.
If you want to get really deep, throw her legs over your shoulders and pound away. You will see a look in her face of fear,pleasure, and complete ecstacy.
There is a position that i sort of invented, and I say this because I have never seen it mentioned in a book, website, porno, discussion, conversation etc etc.
That is pure magic. Unfortunately, I
1) would have no way of describing it (sorta)
2) am not even sure if i would be willing to give this one away, because it is truly unbelievable. i'm thinking about it now and haha, wooh!!!
If your not used to those last two I mentioned you will cum quicker than normal, but practice makes perfect

But
If your strong enough where you can flip her around, use those as your last two positions and you will not dissapoint. And don't for get the walls, nothing will make her feel like you have the biggest dick on this earth more than hitting up against the walls. I could go on and on, but let me know what else your looking for, and i'll be more than happy to share.
Hope this helps
Danny Boy