TEA, (I know, I know) fairly explicitly (no pun intended) indicates that Chamberlain Karsoth was sexually abusing his slaves.
Chamberlain Karsoth was not part of the Amarrian mainstream religion.
He was a blood raider and his decadence and perversion as a human being had been taken to its limits by portraying him as sex maniac with penchant for orgies full of slave children.
That does not qualify as portrayal of the Amarrian culture when it comes to treating slaves.
It does portray well how the mighty can do whatever they want, which they have in the past, Kor-Azor heir for example.
There is also PF that states that they cannot do whatever they want, without any repercussions.
Kor-Azor heir chopped to slivers while he was alive.
Two things.
The first.
The same thing applies to slaves for a Holder as it applies to a Heir for his subjects.
There is no immunity for status as the previously mentioned bits of PF state.
It may mean that a Holder has to cause permanent damage on millions of unrepentant slaves to get a punishment (and their enemy to alert the religious authorities) but he will be punished.
It may mean that a Holder has to sexually abuse a dozen slaves on the brink of freedom to get any kind of punishment (and their enemy to alert the religious authorities) but he will receive punishment.
It may mean that a Holder sticks his tiddlywink into the arsehole of his favourite bed slave (and someone tells everybody about it) which means that he will not get married to the family that would improve the status of his whole bloodline.
A culture as old as the Amarrian one does have its failsafes to keep the whole slavery thing turning into a boinkfest for religion nerds.
The second thing.
The purity aspect of the Amarrian religion is quite well stated in PF.
The True Amarr are the Chosen because they never turned away from God.
They've spent the past milennia serving the Empire so they've done so much penance that they can be almost certain that they (and their whole bloodline since the day they were created) can reach the pearly gates.
Slaves (and all non-True Amarr) turned away from God and were lost for... lets say quite a long time.
Hence most of them (and their bloodlines to the way back when) have a long way to go, until they can even be given the choice of Free Will (meaning that when they are free, they are so indoctrinated that they will make the right choice as dictated by the Amarrian culture.)
Without Free Will someone is paramount to an animal.
Therefore Amarrians can have slave breeding programs without any kind of moral pangs.
Therefore diddling a slave or being diddled by a slave is paramount to bestiality or paedophilia.
To the mainstream culture of the Empire those that are fucking slaves are perverts.
If they do it in the public, they get trouble out of it.
If they do it in the public so that a heathen can find out about it, they are stupid and perverts.
If they are capsuleers, mehhhh, they're pretty much going to burn in hell anyways so who gives a shit.
Just a clarification on a thing or two.
The bloodline bit.
The sins of the father are visited upon his children.
It's a pretty old religious chiche but it seems to be constantly working in the Amarrian religion to a greater degree.
It has not really been addressed directly in PF so its mechanics are not clear.
It does seem like your immediate family is affected by your actions, in their social position in the Empire and in the state that their souls are in the eyes of the God (Empire was created to purify the spirit of Man).
In cloning this link is severed (until the zombiepsychicbitchqueen.)
In slaves (and heathens) it goes back further, all the way to the time when they turned away from God.
(When they have freedom and they have truly embraced God they get to start the tally over.)
This would be another reason for having the slaves in Hell on Earth-conditions for quite some time.
Why this card house of assumptions about the Amarrian religion and culture?
Mainly because it seems like a good way of dealing with all the psychological trauma that the slaver, not the slave, suffers.
De-humanization used as a protective tool on a societal level that enables the society itself to declare war on the unknown with wild abandon and a tool for protecting the integrity of the societys culture.
But I ramble, I'm off for brekkies.