Buss and Schmitt[43] stress that although long-term mating relationships are common for humans, there are both short-term and long-term mating relationships. Buss and Schmitt provided a Sexual Strategies Theory that describes the two sexes as having evolved distinct psychological mechanisms that underlie the strategies for short- and long-term mating. This theory is directly relevant and compatible with those two already mentioned, Life History and Parental Investment.[44][45] Males tend to appear oriented towards short-term mating (greater desire for short-term mates than women, prefer larger number of sexual partners, and take less time to consent to sexual intercourse[45]) and this appears to solve a number of adaptive problems including using fewer resources to access a mate.[43] Although there are a number of reproductive advantages to short-term mating, males still pursue long-term mates, and this is due to the possibility of monopolizing a female's lifetime reproductive resources.[43] Consistent with findings, for both short-term and long-term mates, males prefer younger females (reproductively valuable).[43][46]