The Torah commands the Kohel Gadol: ????, ??? ??????? ???. The Rambam notes that this is a mitzvas aseh.
R’ Moshe Sternbuch suggests that this positive commandment for the Kohen Gadol is in addition to the negative commandment preventing him from marrying a divorvee, widow etc. Meaning that the Kohen Gadol is commanded to get married.
This is in stark contrast to the leaders of some other religions. These leaders are asked to seperate themseves from all pleasures of this world, to the extent that they do not get married. Yet the Torah stresses marriage EVEN to the Kohen Gadol, who can serve Hashem in ways no other member of klal yisroel can. The Torah is telling us that this does not lessen his level of holiness in any way. In fact he sanctifies his body through the fulfillment of this mitzva.