I think the tea analogy is really useful. The really important part about consent that can't be stressed enough, in my opinion, is that individuals have the right to both give and WITHDRAW consent at ANY TIME, before or DURING sex or any sexual activity.
Again; let's look at the cup of tea analogy. You ask them if they wants a cuppa, they says yes. Great. You make them a cuppa and they take it and start drinking it. Fine. After half of it they decide they've had enough tea and put the cuppa down... don't then grab the tea and force the rest of it down their throat just because they said yes to a cup of tea and drank some of it! The reasons don't matter, they wanted tea before, they had tea, now they don't want tea, so don't force them to keep drinking tea.
There was a recent case in Ireland I think on the radio news, where basically a rapist got out of being charged in court because the defence were able to present the victims underware from the night of the incident, that happened to be a skimpy pair of nickers or thong or something with a see-through lace front. I was both angered and disgusted that this utter bull**** is still going on! In 2018!
When will people understand - not just people, but the ****ing learned (supposedly) people of law and justice - that it DOESN'T MATTER what the victim wears, what they do for recreation, how many sexual partners they've had, how sexually liberal and adventurous they are, how much they'd had to drink that night, how provocatively they were dancing, if they enjoyed the abusers company beforehand, laughed at their jokes, kissed them in the club, invited them back to their place... if they say no, IT MEANS NO! They are not obligated to have sex, or even to finish sex with that person after having started it, if they, for whatever reason (doesn't matter what it is), don't want to anymore and say no/stop/etc. IT. IS. RAPE. End of story.
Sorry for the rant by it makes me mad that this still goes on, even today, even in a court of law.