With Valentine's Day this Thursday, here's some relationship milestones, and how long they typically take for couples to reach.

It takes an average of seven-and-a-half months for your relationship to hit the 'comfort zone,' according to a new study. So if you just started dating, that's mid-September.  Here are ten dating benchmarks and how long it takes to reach them.

1. Sleeping together for the first time, 4 months and 17 days. Obviously it's a lot shorter for some people. Especially in the age of Tinder.

2.  Sleep in the same bed, 4 months and 21 days.

3.  Shower at the other person's place, 4 months and 29 days.

4.  Cry in front of them for the first time, 5 months and 24 days.

5.  Sit in silence without feeling awkward, 5 months and 27 days.

6.  Talk openly about her 'time of the month', 6 months and 13 days.

7.  Walk around naked, 6 months and 18 days.

8.  Share a deep secret with each other, 6 months and 19 days.

9.  Let them take care of you when you're sick, 6 months and 21 days.

10.  Use the bathroom with the door open 6 months and 24 days. Passing gas in front of each other just missed the top ten at 6 months and 25 days.

The survey also looked at the top things that LONG-TERM couples are comfortable doing. Letting them take care of you when you're sick is #1, followed by not wearing make-up, crying in front of them, and snoring in your sleep.

(SOURCE: DigitalHub)