REGULAR SEX MAKES US SMARTER The result: those who indicated that they were sexually active at least once a week scored higher when assessing cognitive functions than participants who made love less often. The winners of the tests were those who slept with their partner several times a week during the study period. An increase in memory performance can be caused by neurotransmitter substances dopamine and oxytocin. They are released during sexual activity and transmit signals to the brain. It remains to be seen what specific chemical and biological processes such results are associated with.