In no way will swallowing your husband's cum harm or injure you. It is actually a good source of protein. Also if you are having problems of conceiving and want children by swallowing his cum the antibodies in your system will become used to his sperm and not attack it as readily allowing more sperm to have a chance of connecting with your eggs.

Sperm may be swallowed as many times as you and your husband may desire with no ill effects be it hourly, daily, weekly, or even monthly. The only thing that would cause a problem is if he has an STD.

Are you seriously being serious?