how do yall organsm

how do you know when youre going to orgasm ? i never know if i do or not so when he asks if i came i say idk or if he ask if im about to cum i said i dont know because i dont know😭. how do some females cream and some females squirt 😭😭 i dont get this. like he tells me all the time im wet and all you hear when we have sex is water sounds but i dont cum , cream , or squirt . but my legs shake