It is absolute BS that he "needs" to get off every night. People can go without sex if they want to/need to and have absolutely no problems. Sex can help people fall to sleep, but it's not needed to do so. If you complaining can ruin a whole night, then he doesn't seem to have very good mental control over his body.
In order to be on the same page, you have to talk about it. Tell him how you feel and talk about what you both can do to make it better. You have to have open communication to make it work.
Also, be cautious of having anal sex. Your anus is not meant for a penis and can cause permanent damage. It can cause fecal incontinence, which would require surgery to fix, if that is even an option for some. I know of a few people who have it now from having anal sex.
His body is probably use to ejaculating once a night before going to sleep. If he sustain from having sex so much, his body will adjust. It's called changing a habit.
If you're not enjoying sex because it's too much, you do have the right to say you're not in the mood. He's not going to leave you. Explain to him how you feel afterwards and if the two of you space it out more, sex will me more pleasureable you and him.
If he needs to get off once a night, tell him to masturbate then...look forward to the next night.
You're right, sex does become very boring when it's done 7 nights a week, 30 days a month, etc.
Spend some nights just doing foreplay. Give him a blo job while he rubs your g-spot and lick your clit or give him a han job while the two of you passionately kiss the night away. It does not have to end in sex all the time.
And too much anal is not good. You need to space that out. You don't want rectum issues. Your doctor will tell you too much anal=anal problems...
If you want him to get off faster, stimulate his mind while having sex. Make more moaning sounds that will drive him crazy and say things like "give it to me now baby, I wanna feel your come now"
Catch my drift...