I’m in a similar boat. Ended a 10 year relationship last year and now finding my feet in the world of OLD after being out of it for so long!
Back when I met my XP I would only date one person without planning any other dates. I actually ended up with him because he contacted me but I was already going on a date with someone else. I cancelled the previous date because I was ill and then had to choose to rearrange with the other guy or meet XP! Maybe I should have done both? 🤔
These days I’m embracing it as a bit of fun.
So have been for lunch dates about 5 or 6 times with a guy I like but don’t really fancy, to see if anything more came of it. It hasn’t.
In between those I’ve had chats with other men, a single but fairly successful date, which then went on to him being over invested and a bit clingy, I’ve met up with a long term acquaintance for (what was obviously going to just be) sex, and planning that again soon.
Meanwhile I’m planning a first date with two separate men from Bumble and just matched with a 3rd. 
At my age (late 40s) it’s a numbers game and I know I’m going to have to meet a lot of men to find a good one, so I’m not going to wait weeks in between each. I won’t sleep with the others while I’m shagging the FWB but I don’t see why I should miss out on good sex if these dates end up being duds. I may well judge a man if he was doing the same, but I wouldn’t need to know the ins and outs of his sex life before we started actually dating and they don’t need to know either, so I’ve squared it with myself.
Just agree to whatever anyone invites you to (if you want to do it). You don’t owe these guys exclusivity yet. If anyone is nice enough after a first date to stop meeting others you can always cancel them.