Every woman is different when it comes to orgasm. Some are very orgasmic, others take work, some have a hard time. I do not worry about them so long as they seem to have a good time - not worrying takes the pressure off. There are clues though - erect nipples, pussy naturally wet, not just from lube, shaking legs, guttural noises, moments of stillness, embarrassment, etc.. Most MPAs are working, so orgasm is unlikely (especially a young pretty woman with an old overweight guy like me), but it sometimes happens for real. There really are SWs who like having a lot of sex with many partners, rare though they may be.