Sex life with teenagers

My husband and I are taking guardianship of my 17 year old twin sisters, they’re moving in in 2 weeks. I’m very excited to have them here and I feel kind of selfish for even worrying about this, but how do you have sex with teens in the house? Should I just send them off to the movies or the mall with some spending money so we can get some “alone time”? They’re my sisters, so they know I have sex, but I’m honestly deathly afraid of them hearing us/walking in on us! My husband and I had a bit of a rough patch for about a year where my sex drive was nonexistent due to medications I was on and a miscarriage that broke me emotionally, so it’s very important to me that we keep our sex life fun and healthy because I now know how much no sex can affect a marriage. We don’t have any kids of our own and haven’t ever had roommates since being together, so we’ve never really dealt with having to hide us having sex. Any advice for a DINKWAD couple going straight into having two teenagers?

Editing to add I’m 23F and my husband is 24M, so we’re not that far apart in age! Just realized I forgot to put that in there

Editing again to add they won’t be in high school due to our mom encouraging truancy (to the point of making them beg friends for rides to school) and drop out so they can work. They won’t be getting jobs so they can put their full focus on getting their GEDs (grades are so bad they’d have to start high school from the beginning and doing that isn’t an option as the high schools here) and getting them ready to enlist in the military (they want to join the Air Force like I did). I am thinking about finding some volunteer opportunities and/or local clubs for them to join until the GED classes start later this year though!

Edit: We moved the girls up here yesterday! I just talked with them separately, just me and them without my husband or mom there, and was like “Hey, yall know I’m married and do married people stuff, is it cool if I give y’all some spending money and drop you off at the mall or the movie theatre so we can have alone time?” and they said (verbatim) “Girl you’re GROWN grown, we know you have sex, we can just go to the pool or mall or whatever” so it was a non-issue that I was nervous about for no reason lol! Thank you all for all of the tips, and to the people that DMd me weird things, you’re gross. No, I’m not worried about my husband and sisters being in the same house, if I was I wouldn’t have married him, they are my life and I cut off any person who speaks in a disrespectful or gross manner about them. And no, just because I posted about my husband and I having sex, it DOES NOT mean I want dick pics or other sexual messages from you randos! Otherwise, it’s going great! They even cooked dinner for us all tonight! I’m so glad to have my babies safe and sound under my roof! I will definitely post to this sub with future questions, of which I’m sure I will have many. Thank y’all from the bottom of my heart!!