....Men and women are wired differently in thinking through decisions like this ... men being willing to risk to get that instant gratification. One reason guys often have premature ejaculation problems, by the way.
....Men often think they know what they want, then once they've gotten what they want, they tend to become interested in other things and/or become distracted. Not so with a woman ... if she finds a man that rings more of her "bells", she's not going to become distracted or want to move on to other things ... thus the issue of EGO and jealously arises, and the couple sometimes finds out that its not working for both parties ... but, its too late.
....So, I advise couples, who wish to involve others, to move slowly to give everyone the chance to adjust to the new arrangements ... try to avoid putting unnecessary stress on the marriage or relationship.