For teenagers, gender influences their sexual intimate relationships with other. As teenagers enter into intimate relationships, their neurotransmitter called oxytocin is really critical. Oxytocin is a neurotransmitter that is responsible for human bonding. Females have more oxytocin than do males, so when females enter into an intimate relationship, females have higher levels of oxytocin. They are more likely to feel like this is a long-term bonded relationship. Males are less likely to feel that. They may feel that initially with the rise in their oxytocin levels, but that normalizes and drops off. So the boys in these intimate relationships, the next day or the next week, they really feel like that relationship was no big deal. But the girl still feels like it was a very big deal and that it meant something, perhaps more than what the boy thought. This can lead to a lot of hurt feelings and disappointments, particularly on the part of girls.