Crop dusting aka the act of farting while moving through a crowd or passing by someone else

Then I would say it’s just nerves. Just keep going at it honestly. It gets better each time, and word of advice don’t use all your energy up in the beginning. The second you start to get tired it’s pretty much a grind to finish. Just pace yourself and find the position that feels the best for both of you

If you are using a condom then that’s probably why. Not saying don’t use a condom but I would suggest talking about birth control with her and figure that out.