Today, my senior researcher was absent from school. According to my professor, he telephoned the professor that he was out of shape.
But, I have to remember that he went to meet his sweetheart on his way home from the university.(I'm not sure that he really went home. Possibly, he spent the last night with his sweetheart.)
So, at least, the lower half of his body was in good condition. Then , it is theoretical to guess that his vigor was emitted with his sperm. But, it would be dangerous if his vigor were to be given to his sweetheart with his sperm.
Anyway, the fact may be that my senior researcher told the professor a lie to date with his sweetheart.