2 shots is a solution for lots of guys. Either do one yourself a couple hours ahead or do 2 shots with the SP, provided you have time, and the ability to do multiples. I'm also preferable to cowgirl position, although the last year or so, I have found it takes a lot longer to cum doing that, and some ladies have complained their legs were getting sore from doing it so long. The way she moves during CG also plays a part. If she rides up and down on it, I'll cum a lot quicker than if she takes it all in and grinds back and forth. The back and forth grind also draws the most intense orgasm out of me if she can stay on it long enough.