Avalanche,
Never tried them! I think penis size is something that only matters to guys... I mean sure, there's a novelty effect for some women with big dicks, but you can still hit all the places you need to so long as you're not abnormally tiny down there.
However, I did start doing kegels (yes, there's an exercise for men too

and it helped in a myriad of ways. My erections are easier to obtain and much harder/stronger, and I last much longer before orgasm. I can pretty much control orgasm completely at this point. Possibly a bit of a placebo effect going on, but I have to believe it has helped.
J.J.