LOOSE VAGINAS, Promiscuity, Childbirth??? Confusion???

So like I plan on marrying my bf in like two years and then having two (and only two ) kids... I've beard of MANY women saying they feel loose and an article about how a woman said her husband can't feel hardly anything since she gave birth. I know this is a long time from now when I will have kids but I was really wondering, will I be loose after I have kids??? It's something that really worries me, I talked about it with my bf and he said it's okay if that happens but it's an extreme worry for me cuz I'm rlly umm ..tight and don't want that to happen...id be depressed. Plz no hate