How often does the normal 18-25 year old have sex a month

7 times a week, usually.

Man when I was 18 I was hitting it like 3-5 times a day!. What's this 5 times a month crap? get that booty meat! get it! go! why you still reading!?.

You forgot to specify alone, or with someone else.

Less than me. That's for damn sure!

I'm 22 and my fiancee's 30. We do it about 5-6 times a day. In the weekend we just stay in bed all day and honestly, I can't keep track on weekends. But we do it over 5 times a month that's for sure. For all couples we know it's the same.

Ranging from two to four times a week. Sometimes more, sometimes less XD
The record is 12 times for one week (Beach vacation with girlfriend)

We both enjoy it, so nothing bad about having a lot of sex.

when i was that age it was 7 + a week

When my bf and I were 20 years old, he want sex at least once a day.

3-6 per week
20-50 per month

Varies way too much to come up with any meaningful number. If you limited it to only people with a steady partner, 2-5 times a week is probably the norm.