Final answer:
The correct answer is romantic love, defined by passion and intimacy, without commitment, according to Sternberg's triangular theory of love.
Step-by-step explanation:
The type of love defined by passion and intimacy but no commitment according to Sternberg's triangular theory of love is romantic love. This falls under the category of love experienced at the beginning stages of a relationship where there's a physical and emotional connection but not necessarily a long-term commitment between the individuals involved. Such love is the stuff of crushes, infatuations, 'love at first sight,' and the early stage of love affairs which is often characterized by a strong attraction and attachment to another person.
Passionate love is characterized by intense emotions, sexual attraction, and anxiety that absorption in another person often brings. For instance, a couple experiencing romantic love might feel ecstatic when things are going well and devastated when they're not. This stage of love is often where people may feel 'head over heels' or utterly fascinated by their partner.