Sorry that I don't have the proper vocabulary but I have an idea what it might be. You probably realize that an ejaculation doesn't consist of only sperm. There is an amount of "lubrication" (don't know the proper name) that makes it easier for the sperm to navigate. Sperm (itself) is thick, the "lubricant" is not. Naturally, once exposed to air the lubricant dries very quickly leaving the "thick sperm" looking even thicker! Hence, your description of "gel"?
You say that this is "new"? I believe that with age this lubrication is produced less than when one is younger. Could this be the situation?