What causes numbness in butt and feet? is that sciatica?

Maybe: Sciatica usually refers to shooting pain coming from the back going down one (not both) of the legs. Regardless such pain represents an irritation of some structures in the body. Numbness represents a nerve (somewhere) not functionally properly. These conditions require an evaluation by an appropriately trained health professional.

Disc herniation: This is not sciatica but those can be alarming symptoms of spinal cord or nerves. Most commonly it is caused by disc herniation. Mri is necessary. However even in event of herniated disc surgery is not always needed.

PInched Nerve: The sciatic nerve is not the cause of the pain source, it is the result of an irritated nerve typically in the lumbar spine (low back) which are caused by herniated disks, spinal stenosis or degenerative disc disease requiring further evaluation by a spine specialist. Erectile dysfunction suggests a significantly pinched nerve(s) i would investigate obtaining an MRI and see specialist soon.