Arousal may be spontaneous, or arise in response to sensory stimulation, memory, fantasy or emotional connection. Here’s how to understand the differences Arousal may be spontaneous, or arise in response to sensory stimulation, memory, fantasy or emotional connection. Here’s how to understand the differences What turns you on? Depending on the person, the answer to that question will vary wildly. But what is really going on under the, ahem, hood when we start to get in the mood? The first