Fun fact: Hard, raw sex is actually considered to be par the course for a majority of demons, meaning pleasure through harsh sex requires ample amounts of stamina to meet their expectations, which is why care and buildup through foreplay is neccessary to build a lasting, loving sexual relationship with a demon.
That isn't to say you can't have very harsh sex with one, just expect a bored, unimpressed partner if you can't pleasure him/her for hours at a time.
But a underutilized method to please demons is words. Often times, demons are there for the business when it comes to sex, no compassion given. So when a partner calls them pretty/handsome, or compliments their eye color, or perhaps even says being with them is the highlight of their day, this causes two reactions in their body simultaneously. The first being a rush of dopamine in their brain, which creates a sort of bond to them between their partner and themselves, something beyond acquaintances or sexual partners, as they are able to make them happy beyond just sex. This response is partly in surprise, as previously stated, compassion is not often expected between relationships with demons. With this new experience, a demon can become addicted to the sweet words of their lover due to giving them a new rush of dopamine to their system.
Secondally, this rush of dopamine coincides with the release of norepinephrine, giving them more energy in their body. Through this and their desire of the partner, a demon will eagerly anticipate sex and attempt to pleasure their partner more intimately than before.
That being said, be wary with what and when to compliment! Compliments must be genuine and involve parts that aren't sexual, and must be used in caution, as a human may accidentally overexcite their demon partner outside the bedroom with a compliment, which will be responded with immediate sexual response from the demon no matter the location.