Can having sex help treat depression?

I asked my coauthor Dr. John Preston this question while we were collaborating on a book about depression management.

His answer is very enlightening.

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It is very likely that orgasms are accompanied by a release of endorphins that then cause a sudden release of the neurotransmitter dopamine. It is dopamine that is likely to be the specific molecule activating pleasure centers in the brain. This also results in generalized relaxation and may promote sleepiness.

The emotional factors are numerous. Probably topping the list is the feeling of closeness and bonding to another during and following orgasms. Separation stress in baby mammals can be quickly soothed by reuniting with its mother, and this is known to result in the release of endorphins. Thus, a part of the emotional aspect of sex is to produce a calming feeling, especially related to reducing separation stress (people, at least for a while, feel less alone).

Satisfying sexual relation can also be a source of comfort as it can provide
assurances of being loved by another. This may be especially true if sexual
interactions transmit the message that the sexual partner is sensitive to the
other and interested in providing pleasure to him or her.

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I can now see how sex with a loving partner could help a
person manage depression.