There's always the most fearsome arguments about circumcision. Leaving aside any religious issues (if you know what a mohel is, it's not really going to be voluntary) there is on the one side the fafct that it does protect against certain sexually transmitted disease and cancers.
Good, good you will say.
On the other side it's always said that circumcision leads to lower sexual pleasure as a result of desensitizing that part of the man.
However, you might want to click through to see that this argument is wrong. Such desensitization almost certainly leads to an increase in sexual pleasure.