What a horrible person.
It's not decent to try and persuade someone to do something they don't want to that you would then also respect them less for - but not yourself.
There is nothing more offensively off-putting to me than a person (man or woman) who wants to sleep with someone but doesn't respect them. The level of egotistical harmful ignorance needed is hideous. Whether it's casual or not, respect is essential. Accepting someone is a different kind of person to you, appreciating that, and still enjoying sleeping with them as a shared choice because of physical attraction is very very different to having a fling without respect despite you being equal part in the very act you condemn them for.
Unfortunately, it's not really his fault per se for being so ignorantly abusive in his thinking and it doesn't actually mean he's a horrible person, all people do bad things without realising. It's relatively widespread and accepted. Lots of people are just conditioned to believe that it's okay or right by the fact so many other people also think and behave this way so it's 'normal/natural'. They personally gain from manipulating others against their will to be used for pleasure without respect for the individual as a person. But they don't see it that way - they see it as them doing nothing wrong, instead just the other person failing and not being worthy enough. How disgustingly horrible, they really don't realise or see it for what it is.
They think that if they like the person they are sleeping with still (as a temporary partner until they eventually find someone to marry or whatever), aren't cruel to them in ways their warped minds would still actually be able to recognise as cruelty and consider them nice enough then it's not bad or wrong to also just still see the partner as being less valuable than themselves and others who wouldn't have slept with them. They don't see the reeking hypocrisy or how that's actually much worse than just being overtly hateful about the person and not being involved with them. To my mind, anyway. I would much sooner be hated and avoided by someone than liked but disrespected and used.