"...become a specimen for our collection. See, we have been building a zoo of intergalactic creatures, and you are to be our latest inductee."
"Zoo?" you repeat confusedly. "But... I'm an intelligent species! You can't just stick me in a zoo!"
Ignoring your protestations, the reptile continues, "We have many examples of the species of your planet in the Earth habitat- don't worry, we shan't put you in an unfamiliar environment. In fact, you will probably find it comparable to the Garden of Eden from your world's myths. Almost all forms of life found on Earth will be in this habitat, and our medical drones will keep you in perfect health. You will be free of disease and of work and of harm for the rest of your life."
Much as not getting to see your true home again is a scary prospect, you have to admit that does sound kinda fun. So you decide to agree to it.
"Excellent," the trunk creature replies gratefully, and moves to the control panel to press some buttons. Soon, you're shot down through an assortment of tubes until you land in an utterly tranquil field. You notice you're still naked- that part of the Garden of Eden analogy was particularly accurate, unfortunately. But as you see the animals wandering around this place, you feel like it's kinda nice and settle in pretty comfortably in the first few hours.
Eventually you feel a strange urge. The air seems full of pheromones, and you feel like you want to... it's not that you want to have sex, or even 'fuck' anymore. You feel like you want to mate. You want to produce new life for this place.