in most cases a person can detect once you have close body contact, if you had a shower within the last 2-3 hours, i always use the shower before in my place, once i arrive i tell the girl, that i took a shower, if they wish i can take again, most of the time they say its fine, except at xoc , where they require you should take a shower, i do always take a shower after at lears and its not too bad