Oh this is going to sound a bit silly but if you can get enough (cm that is) and drop it into a glass of water the sperm is supposed to float and the cm is supposed to sink. I have never tried this myself but hey obviously someone out there has!!

Also the smell, but i think sperm has a bit of a different texture anyway, cant really explain it but it's not quite as "thin" as watery cm.

I take evening primrose oil too to help create a bit more cm - it doesnt actually make you produce more, it just thins it out so it goes a bit further, anyway only take it until you have o'ed, not afterwards as it can be harmful if you are pregnant

Good luck