AITAH: wife wants me to “set a budget” for s’x as part of her sahm role.

I M33 am the breadwinner in our family of 4. My wife is a sahm and it’s a decision we both agreed on. I take care of everything financially food, clothes, bills, household needs etcetera. Problem is, my wife wants me to set a budget for s’x. Meaning she wants to get money for it as she considers it part of her sahm duties. Her absurd and unreasonable suggestion, now demand, has caused a huge fight between us. She said it’s her right since she’d work hard all day and take care of the house and kids then, she has to stay up at night so we can have s’x together and it’s exhausting for her and “time consuming” as she put it. I felt extremely upset and disappointed in her behavior, but she says she’s in the right and that I’m being too selfish to see it. She keeps demanding it but I refused.

AITAH here?