Many posts on this site address the danger of kama raga, but I’d like to suggest one post in particular at the moment:
#4 of the post (last bullet) says:
“In fact, most times sexual enjoyment comes from just thinking about a past experience or an anticipated one. The actual contact pleasure is relatively short-lived.”
If you contemplate the above point you’ll see how true it is and gain many insights. Besides thinking about a past experience and an anticipated encounter, we also fantasize things on our own. Too much work (abhisankhara) for just a few seconds of sukha vedana.
This is an example of kāmachanda, and many of us have it; after all most of us are not anagamis. Contemplate the above point, plus whatever else in the site that deals with kāmachanda / kama raga, at a time when the mind is free from it.
Also, at the moment the mind is free from kāmachanda, notice how “cool” (niveema) it is; that is niramisa sukha, which is longer lasting, and can serve as a “convincer” that sex is not all it’s cracked up to be.
Best of luck to you!