A vast majority of scholars prefer washing feet during Wudu. It is the asal and the basic principle. But let's also remember it is sunnah to wipe over socks.
Shaykh Abu Eesa
After marital relations you are in a state of ritual impurity (called Janaba where recitation of Qur'an is not allowed) which is different from the state of menstruation. During menstruation even though there is a difference of opinion you are allowed to recite Quran without touching it physically. Some ulema even encourage it.
When you want to do something for the sake of Allah, it should truly be for the sake of Allah. You have to struggle and strive to please Allah primarily. Everything else needs to be a secondary intention. Your prime focus should be pleasure of Allah by performance of a good deed. Your focus cannot be weight-loss primarily. When you are fasting for the sake of Allah, what you do during the fast matters. You are not just starving yourself from food. You have to change your attitude. Shaykh Abu Eesa answers and explains..
This issue is happening with brexit and around the world when you take a loan in dollars but they pay you in pounds. When it comes to money exchange it is given hand to hand immediately, and it has to be exact same quantity and in same currency it was received in.