Students’ answers may vary, but they may describe the painful side of love as either an adaptive function or an evolutionary trade-off. In essence, however, adaptations are trade-offs. Romantic relationships have many benefits—safety, security, affection, reproduction, companionship, increased resources, and so on—but there can be disadvantages as well—domestic violence, sexually transmitted diseases, heartache, sharing of resources, and so on. From an evolutionary perspective we are social animals who have strong negative reactions (and physical pain) triggered in our brain when social rejection occurs, thus making it more likely we will try to fit in and have relationships with others, which then increases the chances of reproduction. Those individuals who are more likely to feel these negative emotions, or feel them more strongly, will be more motivated to maintain relationships, thus making it more likely they will reproduce, leading to this trait surviving.