If you do believe in God, then what did God tell Adam, and Eve, in the Garden, Genesis 1:28. "...be fruitful and MULTIPLY..."
Youtube has many videos about the science of attraction, like: https://www.youtube.com/watch?v=T0q-KnaheFE
 A note to men. Men have sex, women make love. Men, if you want to have the best sex life possible, make sure your wife has the best love life possible. Guys, don't jump right into sex, you must pleasure your wife every time. That means long periods of fore play, gentle stroking of erogenous zones; small of the back, neck and shoulders, back of the knees, feet and ankles, inside the thighs,. Stay away from the obvious spots for half an hour minimum; the breasts and vagina. . Never touch her harder than how hard you would rub your eyes. I shouldn't have to mention kissing. That's where it all starts. tender, soft, moist.
Men need instruction in relationship. Anthony Robbins has a couple of videos that teach what you need to do. You need to listen to your wife. These videos are about repairing a relationship. You can use the information to not have a broken realtionship. https://www.youtube.com/watch?v=LsqTZZUM--M
 A note to the girls. Stay virgin till you marry. You are the one who can controls that. When you marry don't be afraid to instruct your husband what you like and don't like. Your husband will be glad to know what to do. Never engage in perverted sex. Perverted sex is just sex, not love. Your nature should take care of the rest.
A video that goes well with this article. https://www.youtube.com/watch?v=oxHIftZVfrQ