Funny thing, Len nonchalantly do it to Rito. When everyone hysterical about it, he coldly remarks it's disgusting and not something to be proud of. Then he did it to several random girls (though he knew when one just pretending), Honne asked if he felt awkward about it, he replied not at all. When Dan asked about equating it to a kiss, Len was
truly offended
"Comparing it to sacred ritual such as a kiss, are you fucking nuts?"
Then Saruyama laughed of that it would be similar to kissing a girl on her sleep (=sekuhara), Len said it's not that, but he has a point. By that point then, everyone concluded Len is lacking enough hormone :|