I have not found the answer to this concern i have....?!

I have not found the answer to this concern i have....?

i have a concern about my boyfriend..he drinks a lot of water a day..probably more than 8 glases of water..but he doesn;t urinate that much only 2 times a day..is this a serious problem?

Reduced urine output could mean, among other things, reduced kidney function. Does he go a lot each time? With the heat and humidity like it has been (depending on where you live), it probably isn't anything I would worry a lot about. He could have some simple blood work done to rule out a lot of things.