It enhances intimacy.
Want more affection in your life? Have more sex with your partner.
Falling in love deactivates parts of your brain

Falling in love deactivates parts of your brain 01:57
A series of four studies of committed couples in the United States and Switzerland found that having sex created more affection, not only in the moments after sexual intimacy but hours later, even in couples with children or those married long past the “honeymoon period.”

恋に落ちると脳の一部が 失われる01:57

Moreover, for couples who felt more affection after sex, the effects were still evident six months later.
“The more overall sex they had, the more affection; the less sex they had, the less positive affection,” said clinical psychologist Anik Debrot of the University of Lausanne in Switzerland, who led the study.
And the sex didn’t have to be intercourse for there to be positive effects, Debrot said. “Moments that were experienced as erotic or sexually arousing were just as predictive of positive emotions.”
CNN contributor Ian Kerner, a psychotherapist who specializes in sex and couples therapy, agrees. When couples keep the sexual dimension of their relationship alive and intact, “it leads to an overall warming up of the relationship, which includes more touch and non-sexual affection as well as higher level of regard towards their partner,” he said.
ローザンヌ大学の臨床心理学者Anik Debrot(スイス)は、「彼らの全体的な性別が高いほど、愛情が強く、性別が少ないほど肯定的な愛情は薄い」と述べた。
セックスと夫婦療法を専門とする心理療法士であるCNNの貢献者Ian Kernerも同意する。夫婦が関係の性的側面を生き生きとしたままにしておくと、「それはより多くの接触と非性的な愛情とパートナーに対するより高いレベルの関わりを含む、全体的な暖かさにつながる」と彼は語った。

It boosts cognition.
If you’re looking for a good reason to energize your sex life as you age, here it is.
How marriage might be linked to lower dementia risk
How marriage might be linked to lower dementia risk
Studies show that keeping your sex life active into old age protects and even improves your brain’s executive functioning and recall. Analyzing data from the English Longitudinal Study of Ageing, British researchers found that sexually active men between the ages 50 and 89 had increased cognitive function, as measured by number sequencing and word recall, even after adjusting for quality of life, loneliness, depression and physical activity.
Women had the same benefit from sex for memory but not number sequencing.
Both men and women who were more sexually active did better on the tests than those who had less sex.
In a follow-up study, the researchers found that having sex at least once a week was highly predictive of improved cognitive functioning, especially verbal fluency.
より性的に活発だった男性と女性の両方 が、性別が少ない人よりもテストでよくなった。