An interesting little article published March 2018 by Lisa Yang, Alexander N. Comninos & Waljit S. Dhillo has suggested a link between reproduction and emotion.
Here is part of the blurb:
Species survival is dependent on successful reproduction. This begins with a desire to mate, followed by selection of a partner, copulation and in monogamous mammals including humans, requires emotions and behaviours necessary to maintain partner bonds for the benefit of rearing young. Hormones are integral to all of these stages and not only mediate physiological and endocrine processes involved in reproduction, but also act as neuromodulators within limbic brain centres to facilitate the expression of innate emotions and behaviours required for reproduction.
Food for thought.