I do feel like I can get very close to orgasm from internal stimulation , but I always add a vibrator at the last minute. I get to the "need to pee" feeling and even a bit past it, but I have to thrust whatever toy I'm using pretty fast, and...my arm gets too tired to keep up. I also have a tendency to tense my legs before orgasming, so if I'm right on the cusp of climax and don't come, my legs can cramp up also. In any case, I have to keep stopping and starting, and eventually I get frustrated and just throw in the vibe to finish myself off. I feel like this is a weird problem to be having, but has anyone else encountered it? That it's just too difficult to keep up the stimulation long enough to orgasm? And if so, have you found any solutions?