My wife and I have sex every two months or so.

Been together 7 years married 6, she's a really good person, stay at home mom, raises our two kids that 4 and 5 and theyre fine, we're pretty well off, we are both the same weight as when we met and I am not balding or greying, we do not argue or struggle, ive talk to her so, so much about this and she constantly insists she is really happy, loves me, is attracted to me, is not depressed, she says she couldnt wish for anything different, we go on date nights every week, have fun, go on vacations, have friends, she's not having an affair because we have cameras in the house, I go through her phone and she doesn't have a car (I work hybrid too) and my parents help her with the kids several times a week and on weekends and vacations

So her only answer when I bring up why we don't have sex more often is just a vague "I dont know, im sorry but I dont know" and thats all she'll say about it in any way. We used to have a ton of hot sex even when the kids were born, this current issue started like two years ago and I ask how to get that back and she just says she doesn't know, wishes she knew but doesn't know. Its all just "I dont know"

She's sweet and affectionate and a good mom so idk how mad I should even be at this. Is this normal? I think I want more sex but not at the risk of the good marriage and family we have. What do you guys think? I'm not unhappy either but.. something feels weird about being married and not having sex more often