How do I stop bleeding after sex w/ well-endowed men?

So I’ve been having casual sex (my body count is below 5) and taking precautions but I’ve noticed how little men that I interact with are aware that women bleed simply from having a big dick even if you’re not a virgin. I also do know that you can bleed from other reasons like an std and stuff. The last 2 guys I’ve had sex with, made me bleed and I’m completely aware that’s it’s because they’re well endowed and my body just needs to get used to it, but I’m kinda of tired having to explain to explain after every encounter that this isn’t an STD or my period, it’s just that you have a big dick. One guy literally asked me to get an STD test because he was so stressed and worried, and no amount of me telling him that I am clean and it’s normal when sleeping with someone who has a bigger dick than other encounter’s but ultimately I did get an STD check after that encounter because his stress started to stress me out even though I knew better. I do like it rough and aggressive depending on the person I’m sleeping with, so I get that can also be a factor. So, how do I stop bleeding after sex with big dicks?