Cum: health benefits?

I have heard that cum has many health benefits. Nutrcious? Good for your complexion? Opening(?)  something to do with your cervix in the last months of pregnancy? I've also heard that it is also good throughout my entire pregnancy, I just started into my 2nd trimester? What exactly is in a guys cum that has these health benefits? Sperm? Topically, by mouth, internally? Please tell, I am very curious:)