well def no way for them to hide it lol. it makes a mess. but if he is using a condom and seems to have got his but you can't tell, you can by looking at the condom, or if you want to be more discreet then just see if it stays hard after ward. most will lose erection after a little after wards but can't get erected again for maybe 10min or longer.

youd feel it when u stand up... and it will be white or clear sometimes think an to be honeslt has a funny smell youd totally know

It feels very gooey and when you stand up it all pours out and goes everywhere

You would have a musuc discharge. Either white, cream ,or clear in color

i think youd know if it happend to you. it would ooze out after

Well, all the semen usually tips me off.