1)
How will two warm each other?
1.
Rashi: This refers to a male and female; they warm each other 1 , and beget children. Ri Kara - this is like "va'Yechemu ha'Tzon El ha'Maklos" (Bereishis 30:39).
2.
Rashbam: In winter, they warm each other. Metzudas David - so for everything, two are better than one.
3.
Seforno: Emes is found via two who join together, just like two who lie together add warmth.
1
Ibn Ezra: We find "v'Shachvah v'Cheikecha v'Cham la'Doni ha'Melech" (Melachim I, 1:2).
