When you ask question in public forum , especially like sajha where admin do not enforce anything , you will definitely be trolled. I am pretty sure OP was aware of it. Regarding the real question, upon marriage with citizen, you can file the paperwork and if immigration officers are convinced it is real, then you will be awarded with permanent residency with conditions that can be removed after two years. But regarding you and your wife staying separate, it will be hard to convince the officers. I do not think any reason justifies it. If there are circumstances that do not let you two live together, then you two are not ready for marriage. It just turns out to be only for immigration purpose. In that case , your wife can be penalized as well . And you will be in deep sht for sure. So, either try to maintain your status other way like H1b untill you two are ready OR start living together and settle down for good. About your last question, if they declare it fraud, they have right to cancel your f1.