If you use spermicide can you do oral sex after sex or will it taste bad?

If you use spermicide can you do oral sex after sex or will it taste bad?
There will be a taste it you use a spermicide. It's hard to describe but to me its not very pleasant (especially if you used a condom with a spermicide lubricant) and it can make your tongue feel almost numb. You can have oral sex, its just a matter of if you can handle that taste.
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Why would you use spermicide with oral sex? You aren't protecting anything while you are doing that with dead versus live sperm. Either way you can still get STDs (ie it isn't any safer).