My wife has always had a relatively high sex drive but it hasn’t been as high as mine until she was pregnant. She would start initiating sex every night, asking me what things I wanted to try that she usually wouldn’t be into, and masturbating frequently.
For a few months during her pregnancy, she would come to bed after I fell asleep, put her hand under my underwear and start slowly touching my dick until I woke up. She would of course keep stroking it after I woke up before jumping on top of me and riding me. It was so hot because she was so turned on. You could tell she had been laying in bed touching herself getting all worked up.
Sometimes she would just want to make herself orgasm and she would go to our guest room with her vibrator and orgasm multiple times. She would always tell me during sex the next day :).