Question about pleading "temporary insanity".?:
If the male were to sue the female for damages, that is a civil action.  The defense of temporary insanity is used in criminal proceedings.  It generally would not apply to a civil proceeding.  However, the defense of temporary insanity is (contrary to what you see on television and the movies) extremely rare.  Some states do not allow it at all.  Others, just like the "permanent" insanity defense, restrict it considerably.  

Mental anguish is a tort.  I think it unlikely under the circumstances that a jury would give her much for a mental anguish claim.  The fact that its a marriage that is obviously in trouble, and he would be able to produce his own evidence, would problably not make the case a viable case, IMHO.

The laws governing the above vary greatly from state to state.  For the most accurate information, you should consult an attorney who is licensed in your state.  If you need a referral, contact your local or state bar association.