sharingan -kakashi- reread or rewatch the first 26 or so episodes of naruto and its manga counterpart. it describes the whole bloodline thing pretty well.
I doubt a man can get pregnant. He doesnt have the capacity too since he doesnt have a uterus. sure he could know the mental side of pregnancy but not the physical side. SInce sharingan is a physical manifestation its not probable that it can be "learned"
Second lets say kakashi did learn to use the sharingan(which i highly doubt) why cant he turn it off. if he turned it on, why not off?