It is not a good idea to send "dick pics" to someone you do not know. You have no idea if the person you are replying to is a scammer, wanting the photos to blackmail or extort you.
You should also limit the amount of personal information you give until you can confirm the person you are corresponding with is honest and sincere without ulterior motives.
blackmail? it's a close up of a dick?
Rx, come on, you can't confirm they're honest after you're IN Thailand, and they've stolen your phone
I'd say if you are this worried about online hijinks, you probably are better off that there's no tourist flights into Thailand.
just be aware that while most of those girls are in the game for the money, there ARE a FEW who are really looking for a "long term relationship/true love). Usually if they give out a phone number they're working girls.
p.s. stay away from the "true love" ones, obviously naive as hell.
in general they'll blow you off once they find out you are not IN COUNTRY. WIth Covid, there might be some of em bored an just like some fantasy chat. They ain't gonna discuss which Shakespeare play is their fav at any rate.
Personally, going to TF anymore is like walking into a Ferrari dealership...why tease yourself over something you are NOT going to be able to buy and drive.