Jose said:
Go do it. I'm not stopping you. If you're genuine, it will show!
If you are not, it's also plainly obvious! And i see many are not....
Dear Jose, i reckon you must think yourself to be the special one...
(Ok, if you didn't catch that joke, then it's probably because you don't really enjoy watching premeirship soccer)
Now, I like the fact you raised this issue and it was a long long long time ago when i once raised it and this particular question you are asking seem to make its appearance everyone once in awhile.
While I do appreciate the fact that you are trying to illuminate the very essence of some of these shoot, it wouldn't be fair for anyone of us, you, me or anyone else to make anyway look at such photo shoot the very same way you do.
I have met photographers who genuinely wants to learn but have no luck in getting friends to allow them to do a shoot. Friends will also be uncomfortable in posing for you in a bikini unless you are able to absolutely convince them of your intentions. (which is to practise photography?)
Now, you have make an excellent point which i have quoted above and my answer to you is, you are absolutely right. If one is genuine, it will show. If he or she isn't, then it's also pretty obvious. You need to understand and realise that not everyone will share the same rationale and mindset as you and neither will they be convinced by a 3rd party once they have convinced and rationalised it to themselves.
I wouldn't delve into whether that is considered "proper" or not because it would be unfair for anyone to judge everyone else for their intentions. As it is, there is always 2 parts for a person to be convicted of a "crime", which is "mens rea" & "actus reus" which summuarily means the intention behind the act and the actual act itself.
To be fair, I have seen some photographers doing really well in terms of making really great pictures after joining photoshoots but of course, there are also some pictures that don't deserve to see the light of day but nonetheless, it is still up to the photographer himself to make the choice to post or not to post, to participate or not to.
It's a free market out there. If anyone wishes to participate in a photoshoot, dodgy or otherwise, i reckon it is honestly up to them to make that choice. Jose, I do applaud your efforts but you need to understand that this. While we can try to sway people around us with our ideals and what we consider as being "honest", we cannot "demand" that they do it because i honestly reckon that would just cause them to be more defensive and find even more reasons to justify to themselves why what they do is fine.
I do hope you take this post in the right spirit.
Thank you.