Hard to exactly define explicit as it is a moving target. What was "explicit" 15 years ago may not be so much now.I guess I'm having a hard time knowing the difference. Like, Eva De Dominici in the movie Sangre En La Boca. I didn't see anything "explicit" like dick and vag touching, or vag shots, etc. I don't know if the sex is unsimulated or real. The word "explicit" is a broad term without specifics. It would help to know what is "explicit" about it? Was the sex unsimulated, did it show penetration, did it show her pussy lips, etc..
However we can agree that a couple rolling around in bed under covers with maybe breasts shown and just kissing is not explicit. While showing another couple fucking like hyenas in multiple positions , simulated oral sex, implied cumshot, while showing full female and male nudity, most would consider explicit, while both scenes are still simulated.
Movie ratings boards have tagged films as TV-MA because the sex is too explicit, even though it is not real.
Of course anybody would consider real sex shown as explicit.