Connector and connector assembly

A connector, comprising a first housing (10) connectable along a connecting direction (CD) to a second housing (30) of a mating connector and including a lock (16) to engage a lock arm (36) of the second housing (30);

• wherein:
• the lock (16) is formed with a guiding surface (17) inclined with respect to the connecting direction (CD) of the two housings (10, 30) so that the lock arm (36) is resiliently deformed in an unlocking direction (UD) crossing the connecting direction (CD) of the two housings (10, 30) by sliding in contact with the guiding surface (17) in the process of connecting the two housings (10, 30);
• and
• the guiding surface (17) includes a first guiding surface (17A) arranged in a front area in the connecting direction (CD) to the second housing (30) and a second guiding surface (17B) arranged in an area behind the first guiding surface (17A) in the connecting direction (CD) to the second housing (30) and having a steep area whose angle of inclination (13) with respect to the connecting direction (CD) of the two housings (10, 30) is larger than an angle of inclination (a) of the first guiding surface (17A).