Keroack, in case you haven't heard, is credited with the Scotch Tape® theory of human sexuality:
New scientific studies also suggest that if a woman has multiple sexual partners, this will lower her levels of oxytocin which in turn will damage her ability to bond. Oxytocin is a neuro-peptide most commonly associated with pregnancy and breast-feeding. It seems to act as a human "superglue," helping a mother bond with her infant. It is also released during sexual arousal and there, too, seems to work as a "superglue." Since estrogen enhances the oxytocin response, females are capable of more intense bonding than males, and are more susceptible to the suffering that accompanies broken bonds.vi According to an article by Drs. John Diggs and Eric Keroack, "People who have misused their sexual faculty and become bonded to multiple persons will diminish the power of oxytocin to maintain a permanent bond with an individual."
In more basic terms, sharing the gift of sex is like putting a piece of tape on another person's arm. The first bond is strong, and it hurts to remove it. Shift the tape to another person's arm and the bond will still work, but it will be easier to remove. Each time this is done, part of each person remains with the tape. Soon it is easy to remove because the residue from the various arms interferes with the tape's ability to stick. The same is true in relationships, where previous sexual experiences interfere with the ability to bond.