This was first suggested by Marie Jahoda (1958) and turns the traditional notion of abnormality on it's head by looking at the positives rather than the negatives - mental health as opposed to mental illness.
Jahoda identified 6 criteria - if these are deviated from or are in deficit then you can become vulnerable to a psychological problem.
1) Positive attitudes towards the self > positive self concept > a sense of identity.
2) Self actualisation of ones potential (Maslow)
3) Resistance to stress > coping strategies for stressful situations.
4) Personal autonomy > being reliant on your own resources and remaining stable when faced with frustrations and deprivations.
5) Accurate perception of reality > being realistic rather than seeing things in an overly optimistic or pessimistic way.
6) Adapting to the environment > being flexible rather than rigid, being able to adapt to change.

Just some notes from my psychology class today.
I would say that all of these are related to what you learn through pick up/improving your social skills, and I am very certain that I have improved on them all since i got involved, particularly 1,2,4 and 6.
So there it is, going out and chatting up women regularly is very good for your mental health.