I am an independent escort.
Personally, if I was in a relationship, if my partner had to cheat, I would rather he paid for sex than had an affair. Emotions are involved in affairs, they're not involved in prostitution.
I would think less of any man who is seeing parlour/brothel prostitutes, women in the Soho walk-ups and those with agencies, as to a degree, these women are controlled by others seeking to gain from them financially. I would most certainly be disgusted by any man who picks up street walkers too. But, if they are seeking services from an independent, no, so long as the sex is protected.
While it is true that some men who use prostitutes are social awkward, have issues and there are clear reasons why he is having to pay for sex, not all clients are like that.
It is worth remembering the quote "I don't pay them for sex, I pay them to leave."
The men I see are wealthy, attractive, 'normal', and not the kind of men you would expect to pay for sex, but with me, they are not just paying for just sex anyway. Unlike most escorts, I do not see men for just sex, we spend time together, have dinner and I often spend periods of time with them. For some, they want intimacy but they do not want a relationship, and it is easier (and safer, particularly for the wealthy ones) to pay for someone's time as we both know the boundaries, and they know I will not hassle them for a relationship, or anything else. In one man's case, he is divorced, had really aggressive surgery (and treatment) for cancer that has left him with a few erectile issues that has really hindered his confidence. He spends time with me because he does not feel under as much pressure to perform.
When I screen men, I look to see the kinds of women they have seen previously, and if it is anyone who is not an independent, part-time escort like myself, I won't see them. I charge high fees and this screens out a huge proportion of the men who are just looking for cheap sex. And it is worth remembering, when sex is available in a Soho walk-up for as little as £30 + £2 (for the maid) or a blow job from a street girl can cost as little as a fiver, that some men will think nothing of paying upwards of £450 p/h.
What has surprised me the most about prostitution is just how many men are seeking paid sex, and paying for sex. I reckon it is about 1 in 4, and possibly 1 in 3.