Bottom line -- for the most part you're being used
"The researchers found that many of the women did make noise but not necessarily while they were having an orgasm. Instead, 66% said that they moaned to speed up their partner's climax, and 87% stated that they vocalized during sex to boost his self-esteem. Women also reported making noise to relieve boredom, fatigue and pain/discomfort during sex."
And ol' double-wide thought it was due to his extreme prowess...
http://www.cnn.com/2016/11/13/health/women-moan-sex/?iid=ob_article_organicsidebar_expansion
"The researchers found that many of the women did make noise but not necessarily while they were having an orgasm. Instead, 66% said that they moaned to speed up their partner's climax, and 87% stated that they vocalized during sex to boost his self-esteem. Women also reported making noise to relieve boredom, fatigue and pain/discomfort during sex."
And ol' double-wide thought it was due to his extreme prowess...

http://www.cnn.com/2016/11/13/health/women-moan-sex/?iid=ob_article_organicsidebar_expansion