Whether women or men are more apt to search actively for a mate: Kiddushin 2b
Whether women are happier married than widowed/divorced: Kiddushin 7a, 41a; Bava Metzia 67a
Whether a Deaf and Mute Man will prefer to marry a woman of his own type or not: Yevamot 110b
People want others to know them as being married: Yevamot 107a
A woman wouldn't allow a man to finalize his marriage to her with a payment of less than a specific minimal amount called a "Perutah": Kiddushin 3a-b
Being especially careful when speaking with one's wife, due to her native sensitivity: Bava Metzia 59a