The issue is that whatever country you come from it's not acceptable to tell boldly tell police, immigration, or customs officers that you go to Thailand to fuck legal age boys (especially using the word
boys) - unless you're prepared for the added attention and scrutiny which will inevitably result.
If you are saying that you routinely make this statement and that there are no repercussions then (as I said) I find that very hard to believe but I won't call you a liar.
At the very least I'd expect your passport to be "flagged" - which you won't of course know about