Second wife.....love that comment dude! For what it's worth I wash my hair every other day and never had any issue with it causing hair loss. That said if you use a strong shampoo like Nizoral that can make your scalp become very dry if used too often I imagine it could potentially cause problems over time. I'm not saying Nizoral is a bad shampoo it's a great shampoo but if used everyday some experience drying of their hair.
We naturally shed hair daily. Having around 90% growing and 10% going into the resting phase and shedding. Washing your hair isn´t going to cause excessive hair loss unless literally pulling while shampooing, traction alopecia. It may affect the quality and condition causing the hair to break or get split ends. The loss is caused when the growth cycle changes. We start to shed hair faster than we regrow so we actually have less than the 90% on our heads growing at any given time.
Once a hair transplant has matured and all the growth is naturally growing it behaves no differently than before. So whatever your normal shampoo regime was can still be. Oily or dry scalp needs a different shampoo type and washing pattern.