Fall back plan must always be to trust your own instinct OP. If you are asking the question, that means you are uncomfortable with it and isn't the point of finding the right one for you, that is is like minded with the same principles and morals. So if this rings warning bells to you, walk away.
And now I am going to contradict myself. I am married now, but have never done one night stands, I have to be in a committed relationship to "sleep" with someone.
Options for women are must wider now on the sex front and its more acceptable for women to have casual sex than it was in my era. And I am grateful that women rightfully have that choice but its not for me. There are benefits to both lifestyles and they can be transitory periods. Personally I do not want a man that sees bed hopping as a hobby or past-time, I want someone who sees the benefits of long term committed relationships and is willing to wait for sex should I so feel that is necessary. I know that there are some men who feel the same about the woman they want in their life.
Internet dating etc wasn't around when I was very first single so you generally dated someone from your social or work circle so you knew their reputation, if not them. Yes there were exceptions but that was the norm. So if you are on a blind date or online, have do you assess where that person stands on their sexual activity, if they are on the same wave length? One sure fire way is to ask to bed them and you will know straight away, or perhaps make crass jokes to ascertain their reaction, and yes they may step over the line but I ask my self, how do you know?
Its difficult isn't it and I don't envy you. If my hubby dumped me, I don't know how I would cope with the dating scene now...although I did only meet him 15 yrs ago ONLINE. But I just knew we were on the same wave length and I had no doubts. I also spent several full days with him, which in reality was probably like a months worth of dates time wise before the subject came up in depth.
So yeah, follow your gut instinct. Know your own worth, because if you don't, they won't!