<human>: Me: Inexperienced, she's one of my very few sexual partners
Her: She's had 10x more sexual partners than me, likely around 20

When we met, she was in to sex a lot. We knew each other for about 3 weeks, the night we started dating, we had sex. Some days, we've had sex up to 7 times a day, when she's on like this horny "spree". This would put us at around 15 times a week during some weeks.

Now we are 6 months into the relationship, we might have sex once or twice a week, sometimes none. Given she is one of my first relationships, I never really experienced this. 

It's not that I don't initiate it, she's just like "okay, good night" as soon as I get in bed, like to the point where I don't even bother going to bed at 9 PM to watch TV some nights anymore, and I just stay up doing work.

This might be normal in some relationships I would think, but given she has a sexual past of enjoying sex with a number of people, I kind of thought she would still be into it still.

Is such a massive drop off normal after 6 months? Friends said it would die off, but I feel like what they say after being married for 20 years.

Can you give me the gist of the text in a nutshell?
<bot>: 6 months into a relationship, sex life is 10% what it used to be. Is this normal at this stage?