My girlfriend has such low energy compared to me?

She’s always sort of backing down after sex when I want to keep going. She doesn’t want to go out and do things as often. She’s sometimes just there but not present. It’s annoying at times when she just can’t get on my energy level and it’s like she’s constantly drained. She’s taking this birth control and this is a side effect from what i’ve read... any other girls experience this? How do I get her on my level?
My girlfriend has such low energy compared to me?
Post Opinion