getting my friend to use protection!

Help! I need advice! 
My Roomate has a decent amount of one night stands.. which good for her 😜😂
But she always laughs to me about how she didn't use a condom or let a guy finish inside of her.. 
whenever I try and explain that even though she's on the pill she still has a small chance of pregnancy and more importantly getting and STI, she just laughs and acts like I'm overreacting.
I try to say it in a very non-judgemental manner, but honestly I'm scared for her health and don't know how to get the point across that eventually one of these guys might give her an sti...
What would you ladies do?

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