Sexuality as it is perceived and enjoyed in the Inuzuka clan is unparallell in Konoha. Indeed, no other well established clan is quite as open about it as the Inuzuka's. Maybe it's because of their close relations to dogs and their natural care free attitude towards sex; maybe it's because their clan was founded not by a man and a woman but a woman and two men. In any case, bissexuality and poligamy are widespread within the Inuzuka's and soon enough their children learn to deal with it.
Of course, it's never mentioned. People's general perception of sexuality is restricted enough, but clans like the Hyuuga's are particularly upset by that topic. And, also, a shinobi should never let his or hers sexual drives or desires interfere with a mission, training or even character.
The Inuzuka's are a matriarchal society, that is, the mother rules the place. There is no marriage within the Inuzuka's, man and woman don't share a house. A woman can have as many sexual partners as she like, and once she becomes pregnant, the baby isn't raised by the father but by the uncle, granduncle, or other close male relation of the mother. Sex is, thus, completely alienated from family values or material possessions – sex is love and pleasure, and that is all. You are born and live with your close family, but you can have as many lovers as you wish. It started as a way of keeping the clan united and independent from foreign interests – however, it prooved to be a satisfactory contract for all involved, and the Inuzuka's honour it to this day.
Every clan has its traditions, and lost of virginity as a ritual is very important to the Inuzuka's. First of all, the person must be at least sixteen; contraception is manditory; and at least two or more other sexual partners are needed. They can't ever be close relatives, and people from other clans are also allowed. Usually, the bond formed lasts much longer than the ritual night.
However, that was not the case for Kiba.
When the war was eminent, Kiba was worried. He hadn't lost his virginity for respect of his clan's traditions, although he had some opportunities with civillians. The prospect of dying at war as a virgin was unpure, as if his live had been unlived. But he was merely fifteen and the war was weeks away – what if he never came back?
It was then he decided he should fasten the ritual. But with who? It was very clear more than one partner was needed. However, his teammates weren't exactly menage a trois kind of people, and no one would ever understand that this was a spiritual, not a sexual, fulfillment.
He couldn't find anyone. Eventually, he went to war. His mother tried to comfort – rituals were just a reflection of what should happen naturally, its only a symbolic passage. If it should happen, it would; if not, it wouldn't. But Kiba was demoralized, especially when he was cut off from his teammates and put in another squad.
There, he was part of a three man and one woman team. The woman was from Kiri, the two men from sand. One was reckless and loud, the other very shy. The woman was effective, but she always looked scared.
One night, the reckless one attempted to play the hero and got killed. As Kiba tried to sleep, very much disturbed from those events, he heard the shy man crying. He walked over to him, leaning against a tree, and asked what was wrong. The man, however, didn't answer – he just kept muttering between sobs that he shouldn't be like that, it wasn't natural, the was a shinobi for fuck's sake, he wasn't normal, and so on.
As Kiba started to understand his muttering, he asked him "Was he your lover?" and the man looked frightned. "Of course not" he said, and then sobbed "That wouldn't be right. It's wrong. It will always be wrong." And cried again.
"Why should it be wrong? It's love, thats all. It can be stupid, but not wrong."
The man looked surprised. He hid his head between his hands and breathed in and out, as if calming himself. Then, he raised his head and attempted a kiss.
Kiba didn't react at first. He didn't particularly liked this man, and this wasn't an ideal setting for a hook-up. However, as the kissed became deeper, he started to kiss back.
They started to caress eachother. Then, a noise startled them – the woman had woken up. At first, her eyes were wide open and her mouth a gap. Then, she looked as she was about to cry. The shy man looked ashamed. Kiba wasn't. He simply took her hand and lead her between the two of them. She tried to resist at first, but then gave in. She just wanted to be held, she said. They both held her and in a soft, slow way, made love. It seemed to last for hours, a forbidden pleasure as a reward for all the suffering and hardship.
When it was over, Kiba slept happy for the first time in days.
In the next day, however, the shy man was killed and the woman hurt. He saw her again only in the aftermath of war, when she was already engaged to another man.
He returned to his home and the proper ritual was organized. He never discussed the issue with anyone, attempting to crystalize the moment in his memory as the purest of all experiences.