This is part of 2 postings that I cam across on Twitter from @Tams6979 on her blog (here and here), and with Tamara McCarthy’s permission I have reproduced much of what she said and she deserves full credit for this post.
Dr. Stuart Brody, 
PhD, is the author of over 140 scholarly publications and is a Full Professor of Psychology at the University of the West of Scotland (Paisley). Not only does he conduct research in this area, he frequently does so.
In a 2006 study he conducted, The post-orgasmic prolactin increase following intercourse is greater than following masturbation and suggests greater satiety (Biological Psychology, 71, 312-315.), he drew blood from participants (mostly grad students) via an intravenous canula inserted into their bronchial vein every 10 minutes while they either masturbated or had penile-vaginal intercourse. He and his colleagues discovered that after orgasm from sexual intercourse, the increase in blood prolactin levels is 400% higher in both sexes compared with after orgasm from masturbation.
“For both sexes, penile–vaginal intercourse produced a substantially greater (adjusted for response to control conditions, the increase was about five times as great) post-orgasmic prolactin increase than did masturbation.
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