there are usually contractions in a different rhythm you can in theory see from the outside, but for some it’s just in the private parts that aren’t visible from common positions.
with men, if he shot his load 2 or 3 times earlier, it’s also hard to tell when nothing comes out any more.
but i think, if the person wears a butt plug and you tape a little flag to the base, it would probably wave 3 or 4 times distinctively. but don’t hurt each other shoving random stuff up your butt!
there are usually contractions in a different rhythm you can in theory see from the outside, but for some it’s just in the private parts that aren’t visible from common positions.
with men, if he shot his load 2 or 3 times earlier, it’s also hard to tell when nothing comes out any more.
but i think, if the person wears a butt plug and you tape a little flag to the base, it would probably wave 3 or 4 times distinctively. but don’t hurt each other shoving random stuff up your butt!