Naive vs Paranoid

[Cinestry]

So, a guy that I don't know very well has asked me to go on a date tomorrow. Problem is, I think I've been overthinking to the extreme so I guess I'd like to hear some rational thoughts on this.
Basically the problem is that I know from myself that I am just very naive when it comes to dating. I'll give an example to put that in perspective: a few months ago I was on a date with a guy that lived on the same campus as me, just in a different building. He said something like 'oh, I've never been to that building. Could you show me around your apartment for a few minutes before I head home?' Yes, I took that seriously and never did it cross my mind what his actual intentions were, that's how bad the naivety is haha. He was a very decent guy that didn't misuse it though, but it did make me a bit paranoid afterwards. I mean, what if he had been a 'bad guy' after all?
Anyway, this is sort of bothering me for tomorrow. We are going to the beach, which is quite a busy place on Saturday so that's good. A few hours ago the guy started texting about skinny dipping, which made me feel sort of uncomfortable and I just kind of laughed it off but now it won't leave my mind because I get insecure that I'm being too naive again about this comment.. Is he just being flirty, is he serious, is he joking, should I be worried and extra cautious, yeah I'm going way too far into this.
What does it sound like to you guys? Am I being paranoid or would it be naive not to think like this?

[Rareboy]

Oh for God's sakes.

Please get laid. Enjoy your youth.

Stop overthinking everything and throwing up walls against joy.

[meridannight]

okay... going to the beach in the Netherlands in January? and skinny dipping? ..... sure, i haven't been to the Netherlands myself, but it is still next to Germany isn't it?

[Rareboy]

Well shrinkage may be an issue...

I also am intrigued by any people who would have a beach party anywhere in England or continental Europe in January.

Sorry. Hang on. My bells are ringing.

[meridannight]

i won't even go out of my house when it's below 0 deg Celsius.

[Cinestry]

Hahaha I'm in Scotland now, which is even worse than the Netherlands. I don't think he was actually serious about that, but maybe trying to say something in a subtle way, just like the 'can I see your apartment' lol.

Rareboy I do get what you're saying but I don't think I would enjoy getting laid after just one date with someone, that's probably why I am nervous about all this

[JackTX]

After how many dates would it be permissible for him to act flirty if he likes you?

[Nanaki]

A text about skinny dipping sounds pretty harmless to me. I think you should go, be open to having a good time, and see what happens.

[princealbertofb]

After how many dates would it be permissible for him to act flirty if he likes you?

Not very many, I should think. It's all to do with the chemistry of the date, the couple, the relationship.

[Cinestry]

After how many dates would it be permissible for him to act flirty if he likes you?

Ouch did I sound that harsh? I didn't mean to. If it is acting flirty I'd think that is something nice, I'm just scared it was a hint that meant that he is expecting sex and nothing else, while to me sex is the only thing that isn't going to happen tomorrow.