This chapter considers how we might understand the effect that emotions have on the justification of our perceptual beliefs about the world, beliefs that we acquire from a variety of sensory modalities—audition, gustation, olfaction, and so on. The chapter takes the problem to be associated with one of two forms of perceptual influence: penetration or multisensory integration. In any given perceptual moment there are multiple sensory modalities and mental states at play, each affecting the overall experience. Whether we understand the influence of emotion on perception as a form of non-perceptual penetration or a form of non-visual sensory perception of the inner body—interoception—the potential epistemological difficulties remain: How can we be said to acquire justified beliefs and knowledge on the basis of such influenced perceptual experience? As has been the norm, only the five exteroceptive senses of vision, audition, olfaction, taste, and touch are typically discussed in the context of sensory perception. However, as this chapter argues, there is strong reason to accept the claim that emotional experience is a form of interoception, and that interoception ought to be considered when discussing sensory perception. In this way, then, the chapter proposes that clarifying the role played by interoception in sense perception across modalities is necessary if we are to make progress on the epistemological problems at hand.