It's pretty easy for most guys to orgasm, but I think it might be easier for my wife to orgasm than me. As long as I am hitting her g-spot with deep penetration she will orgasm quickly and multiple times back to back. She usually prefers being on top or lying on her stomach. Most of the time, she does not even want clitoral stimulation because it is just too much or doesn't change anything. Occasionally, she likes to use a vibrating ring for clitoral stimulation and sometimes she will orgasm just from oral clitoral stimulation.
It is definitely something unique to each woman and is not only physical, but sometimes mental too! We have been together more than 10 years and the sex has just gotten better and better as the years have passed. We have nothing to prove to each other, so sex is all about pleasuring each other and having fun!