Our Gemara on Amud Beis discusses the value of Isru Chag, the day after the Yom Tov is completed. In fact, it states that feasting on Isru Chag is akin to building an altar and sacrificing on it.
There is a pattern in Judaism of savoring an experience and extending it. We find this represented in a Melave Malka after shabbos, or perhaps even the seven days of Sheva Berachos following a wedding celebration.
In fact, it is a halakha to eat more festively on Isru Chag (see Shulkhan Arukh OH 429:2). We have commented on the parallels between the relationship between Jewish people and God and that of husband and wife Numerous times (See for example Rashi Bamidbar 7:1 and Isaiah 50:1). As Yom Tov is a moment of intimacy between God and the Jewish people and requires an extra day to reflect and consolidate the experience, so too in regard to sexual intimacy it is critical that tender and loving moments are shared together after the act.
I cannot stress how beneficial and curative such a practice is. It promotes a sense of connection that proves itself to transcend physical lust. There is a powerful Midrash about this brought down by Chizkuni (Bereishis 3:13):
Where was Adam [while the snake was seducing her to eat from the Tree of Knowledge]? Abba Chalfta ben Karchi said that after having engaged in marital relations with his wife he was tired and had gone to sleep.
Indeed, the more things change the more they stay the same! In truth a man is drowsy right after sex and feeling satisfied. It feels blissful to go to sleep then. However, often women feel most emotionally connected at that time and want to talk. During those post-coital moments, there is a surge in Oxytocin, the bonding hormone. If your spouse ever complained that, “You don’t really love me, you just want sex,” emotional intimacy and physical caressing after intercourse will go further to demonstrate your love than a six months of couples therapy.
Translations Courtesy of Sefaria, except when, sometimes, I disagree with the translation 
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