[quote=@Aristo]
Are they going to have an insane sexual dimorphism in which the males are ugly ad brutish and the females are all sexy?

[img]https://www.wired.com/images_blogs/underwire/images/2007/05/29/sexual_dimorphism.jpg[/img]
[/quote]

No, no. Though the men are quite a bit taller than the women, and far rarer, they generally look quite similar. 
[img]https://img00.deviantart.net/b903/i/2016/127/1/2/half_orc_male_and_female_variants_5_6_2010_by_ronindude-da1mlbj.png[/img]

[quote=@Sigma]
[@Brithwyr] Sort of, although not like a beehive, it sort of depends. Traditional Grogar Families make up the Matriarch, her mini-harem of mates, and then of course, the children. Although in more recent times, it's just one male and female pairing and children.
[/quote]

Mine are kind of the opposite. Though most leaders are female, men are so rare that they kind of have to have harems. Its not uncommon for one man to be married to a orc girl and all her sisters. Higher ranking orcs might have the traditional one man, one woman thing.