You cannot force someone to believe in the same things you do or practice in something you believe but you can explain and tell them and if they are not interested let it be.
What does "explain" mean? To "explain" something is to tell in detail what something means.
What does "explain" mean? To "explain" something is to tell in detail what something means.
She wanted to know how to explain this
you could talk to her about something that she is interested in or You find one who is.
Explain how you love working with animals.
The word you are looking for is "supportive." It means to be interested in and encouraging of the progress of someone or something.
You can politely express disinterest by saying something like, "Thank you for offering, but I'm not interested at this time."
Something you are interested in, or can get interested in. Something you can complete in the time allowed. Something you can be proud of, even if it is an experiment that fails. Science is about finding where what we "know", fails.
You simply state that fact and thank them for considering you.
To avoid pushy sales tactics, you might simply walk away from the sales person. You could also politely explain that you are not interested in buying something and then walk away.
If this is something you are interested in then give it a try. If something like this is something you would rather do without then let her know you are not interested in trying this type of sexual play out.