No, it's work. Work means that you agree to do some form of labour you otherwise probably wouldn't do in exchange for an agreed amount of money; I don't do my job out of altruism, and I suspect very few people do regardless of what that job is.
You might not do your job out of altruism. That's fair. But do you do your job out of trauma? Because if you removed from sex work, anyone who:
Was pimped
Was trafficked
Is addicted
Is mentally unwell
Has a PD
Was abused as a child
Has any other avenue to feed themselves and their children
Doesn't have a safe home
Was trauma-impacted
Is in an abusive relationship
You'd be left with almost no one. And those women would be paid extortionate amounts of money, eye-watering amounts. The ONLY reason you can get a blow job for a few quid is addiction. Some men are paying a lot but most aren't. And the reason is adverse childhood experiences, abuse and addiction.
Neatly, what that means is that abusive men are paving the way for more abusive men. Some men abuse children, some of those children go on to be abused by other men. The truth is that happy, healthy women, with no abuse in their pasts, and other options, typically don't take up sex work.
And men don't ask BTW. Men will tell you they 'check' but they don't. They don't know if the woman they are fucking has her passport, has to do it for the next fix, is beaten if she doesn't. They simply don't care. And if you gave them the option, statistically, to be treated in the same way as the woman they are doing it to, would they risk it? If you said, "scratch your itch, but if the woman is coerced, a man will come in after and coerce you. If she is addicted, someone will inject you with heroin. If she is trafficked, someone will come in and take you to Romania or Somalia and take your passport away. If she is raped, a man will come in and do the same to you." Would any man scratch his itch then? Of course not. And what that means is that they don't see the women as truly human.