How often do couples have sex on average?

I’m just really curious, how often do y’all have sex with your partner? My partner and I are in a very happy, healthy relationship (been together for 4 years) but only have sex like once every 2-3 months. I told this to a close friend and she thought I was crazy! She said her and her boyfriend have sex at least once a week. I know it’s totally fine, since we are happy that way and there are no issues, but now I’m really wondering what is ‘normal’ 😂😅

UPDATE: thank you ladies for your help with my investigation! Lol 😂 just some additional information because of some of the comments; my partner and I are happy with the frequency of our sex. Both of us have very low libidos and are content with our relationship how it is. I just thought it would be interesting to see how often other couples have sex! Not trying to compare because I feel bad or unsatisfied, just curious because when my friend made that comment I was truly shocked. It’s not something I usually get to talk about with others! So thank you, and for those who were worried not to worry 😊