Psychologically, what is going on with my husband's wanting and
enjoying seeing me have sex with other men while he watches?

Hi, Isis.

  No expert here either.  But I've worked in this field for a while.

  Men enjoy watching their wives for several reasons - you'll have to
ask your husband which one works for him.

  1. One of men's most common turn-on is to see their partner enjoying
sex.  The idea of their partner as a sexual being who actually enjoys
sex is exciting for them.  This goes along with men's enjoyment of
watching their partners masturbate.

  2.  He may enjoy the humiliation of seeing someone else 'take' his
wife.  This does not have anything to do with homosexual desires per
se.

  3.  He may have severe anxiety or uncertainity about his own
abilities to please you.  This is somewhat unlikely as you would
probably have figured this out.

I hope this helps.

I, however, am an expert as far as wierd perversions go.  Your husband
probably has a subconscious bisexual urge.  Freud once commented on
this as being completely normal.  However, Frued also wanted to have
sex with family members.  If you have children, I suggest you run an
extensive background check on your husband as he too may want to have
sex with family members other than you.  Other than that, you should
probably be freaked out and have left him by now as you may be in
danger of a swinger lifestyle.  Thank you for your cooperation.
Sincerely,
Me.

Interesting article on this topic at
http://www.observer.co.uk/magazine/story/0,11913,901011,00.html