Sometimes my labia gets pushed in during sex with my husband and that doesn’t feel too nice. If I wear small cute underwear then one can slip out the side of my underwear and it is very uncomfortable. I basically stick to bikini cotton underwear because of it.
You should try out different lubes for sex and find one that works for you. Some are more pricey, but it’s worth it to use a lube that gets rid of the discomfort and avoids your labia from getting pulled in by your husband’s penis when he enters you.
You could also try wearing boyshorts. There are some cute ones available, and this well avoid “slippage” and prevent pinching or tugging of your labia.