Question more or less the feminine body? why does my vagina do this?

WARNING: PLEASE DONT READ IF YOU AREN'T MATURE :)
Ok...to make it simple..my vagina can suck contained by air, and I can't stop it when i want to. It will solely do it when my vagina is facing sort of upward. like if I am within on all fours OR on my backbone with my legs up. It usually wont in recent times do it by itself but if i were to break open it like spread it sympathetic ,my vagina will inflate. I can hear it suck in the atmosphere and my vagina gets really plain on the inside like its stuffed near air. I know this can ensue when having intercourse from nouns getting pushed in but i've never hear of just doing it from man opened. And its not really from muscle control or anything because I cant trade name myself suck in the upper air it just happen. I can push it out when I want using my muscles or if I stand up it will come out. But I want to know why it does this and if theres anything I can do to stop it. as far as i know there is nought that can stop it... just avoid them positions... apparently it happen alot when girls do yoga... its worst when your having sex though, coz afterwards it makes a REALLY embarassing rumpus lol.
That's pretty normal.
You can stop it by stopping what you're doing to gross it happen.
thats really peculiar, i would deffidently see a doctor