To find proof as to whether he is "in love" or not, Yukimura pats Himuro on the head from point-blank range. Seeing this, Ibarada, an upperclassman in the Ikeda Lab, talks about the need for a control experiment. In other words, in order to prove that the racing of his heart is because of Himuro specifically and not just because he's facing a woman, Yukimura has to pat Kanade and Ibarada on the head too. Himuro, on the other hand, sets out to prove that food made with love tastes better and cooks, but...
It's proof that I've never done 
anything like this with a woman...
إنها دليل على أنّني لم أفعل شيئًا 
...مماثلًا كهذا مع امرأة من قبل
Das ist mein Beweis, dass ich so etwas
noch mit keiner Frau gemacht habe.
Prueba que nunca hice nada así
con una mujer.
Demuestra que nunca he hecho
algo así con una chica.
C’est la preuve
que j’ai jamais été avec une fille.
È la prova che non ho mai fatto
niente del genere con una donna...
É a prova de que eu nunca fiz
essas coisas com mulheres...
Он доказывает, 
что я ни с одной женщиной...