Satr becoming visible during salaah

Q:

1. When I make wudhu, water splashes on my thighs and my pants becomes wet. So when I pray, while in the sitting position, the skin from my thighs become somewhat visible because I wear white pants. Is my prayer valid?

2. When I pray, the wind from the fan hits my clothes and the shape of my private part is visible. Also, when some people go into sajdah while wearing pants, the shape of their testes are seen, is the prayer valid?

Washing impure clothing

Q: If I get some impurity on my clothes then I don't wash it according Islamic law i.e. the cloth is washed 3 times and squeezed with full strength the last time. Instead  I wash it until I feel it is clean. I find it more easier and better than the Islamic way. Is this kufr? 

First wife making husband and second wife take an oath not to have sexual relations

Q: I was married and sometime ago I have done a 2nd nikkah to another lady while my 1st wife was still in my nikkah. Before the 2nd nikkah my 1st wife took an oath on Quran from both of us, me and my 2nd wife that we will not have any sexual relation until she allows us. Now it is almost 1 year that has passed but she is still not willing to allow us. Is there anyway we can get rid of this oath? Please help us as we both husband and wife are too scared to break our oath which was done on Quraan.