It works well in penetration as in any kind of contact of the sexual organs. Otherwise, the lover should dedicate to other parts of the body, as the inner thighs for instance, behind the knees, breasts and nipples, nape of the neck, ear lobes and the abdomen, which stick out as highly erogenous zones. Kissing and licking all around the genitals and shortly thereafter skipping repeatedly to another body part may prove as exciting a strategy. It's important to bear in mind that each body part requires a certain degree of intensity as far as some kind of kiss pressure or tongue contact.