Sexual sin is usually a matter of power and lust, where a person wants another's body for their own gratification. Q. 'Sex without love is dysfunctional'. It's psycho-sexual, affective, emotional. Boundaries are few, if any, and there is a pervasive feeling of innocence and trust. In the Song of Solomon, where two lovers celebrate erotic love, there is an intense, free power about the descriptions of their sexuality.
Sex is more than the 'rub and tickle' of two bodies.
Talk to one another about what pleases you. So don't be bashful about giving information. Read a book every second year about sex and talk about it. If possible, be uninterruptible. Shut the door and lock it.