I think it all depends what YOU want out of it too. If you are looking for a longer term thing, and not just sex, then in my opinion you should wait at least until he has proved his worth (and vice versa).
At this moment in time, I don't really give a shit if the guy I like has negative feelings or disappears after 1 shag, because I might just do the same too. If you are on the same page, it can be ok. My mum always said to me when I was growing up, wait 6 weeks.........The only time I took her advice was when I was entering my 21 year relationship. I made him wait (but I was only 17). This TED talk is quite interesting and shows the difference (kind of) of how men and women fall for each other with a bit of science.
Now I have a raging horn that is like an itch that needs to be scratched, I know I probably won't meet anyone who wants anything longer term when my mood is like this. If I do, and it works, then all is good. If it doesn't I knew what I was getting myself in for.
So if you want, and you know you are secure enough not to feel used or disappointed afterwards, then go for it. If you will be floored by a guy ghosting after DTD, then don't put yourself in that position.
Find out what YOU want, rather than worrying about what they want. If you make them wait, and they lose interest, then that is part of it. If you don't wait and they disappear, same.
Just my view on it, but there are no hard and fast rules about length of time to wait, and how people react. Every person we meet has a story, they all have reasons for behaving how they do. Some people are dating guys in their 50s and 60s, you don't get to that age without developing habits or having a story. Just like you do. You cannot predict how these things will go, I think its so important to keep an open mind. Ie. If I drive 3 hours and sleep with a guy I just met, this might not pan out how I want it too, am I prepared for that??
Its still shit when people treat you badly, but remember we all enter things with an idea, its just they might not be the same as the person you are talking with. I keep thinking however I behave with guys, that is my choice. I am choosing to interact, I am choosing to have sex, i am choosing to persue or not. Like anything in life, you don't really know the people you are talking too, no matter how deep you go. That takes years and still the person you are with can be a stranger and react badly.
Be kind and true to yourself. I have two rules, treat people with honesty and integrity, if someone asks (within reason) I am honest and treat them how I would wish to be treated. If they are a shit, more fool me for being so trusting. So if you put yourself out there and ask a guy on a date and he doesn't respond, it speaks more about them than it does you for example and don't take that to heart. Take care of yourself first and work on those boundaries.
Sorry for the ramble :)
Mr French: he's been in touch, haven't discussed meeting again, I sense he is in his man cave a bit, so i will leave him be. If he decides to disappear (I don't think he will) then its my problem.
My friend said to me when I started tinder " Remember you don't owe ANYBODY anything, do what you want" and its true both ways round.