Apparently men have better sperm with a novel woman
Just read an article on Salon about a study on men's sperm quality changing as a function of novelty! Basically, when a guy has sex with the same woman many times, his ejaculate becomes less plentiful and the sperm less motile. When he has sex with (or masturbates to images of) a new, novel woman, he ejaculated more semen with higher quality sperm. Check out the study:
http://www.salon.com/2015/08/13/how_new_sexual_partners_affect_sperm_partner/
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