Wie kann ich verhindern, dass mein Perineum während des Sex reißt?

Hey! I've always had tears in my perineum due to sex as far back i can remember but it has increased this past year and I'm really worried about it. This is not a matter of lubrication,i always have cut even when I'm wet. Is it due to vagina tissue thinning or what? Is anyone going through this? How did you get through it.. The last time the cut got infected and i had to take some antibiotics before it went away.