I have a 2 part question for context.

I am seeing this wonderful lady. She has a relationship with her family (husband and kids), and because of dissatisfaction and emotional abuse she is just in kind of co-parent situation. We have a open relationship, but she is only having sex with me raw. And it's been amazing so far, I really enjoy spending time with her eating and going out.

1. Is it normal to feel super tired after ejaculating a lot? I mean >4 times a day and sometimes 5. Usually in a span of 2 to 3 hours. Sometimes I feel drained and tired to move and do anything else. Like my work or go for a run/exercise, I don't feel motivated. Is there anyway to combat this?

2. Does having sex with the same person get boring? I mean from a girls perspective. She tells me it's amazing and never felt that good before. It's hard for her to orgasm through penetration(anti depressants?), but she is very satisfied with different positions and she likes longer sessions like 15mins to 20mins of good sex pounding hard. I was wondering if that satisfaction can be better? Can you be even more satisfied.

Thank you