An example stimulation device includes a housing, a longitudinal axis of the housing being an axis of longest extension along a length of the housing from a first end to a second end of the housing, a first portion of the housing defining an opening to a chamber, a central longitudinal axis of the first portion of the housing extending through the opening, the central longitudinal axis of the first portion of the housing disposed at a non-perpendicular angle relative to the longitudinal axis of the housing; and a drive unit disposed in the housing, the drive unit to cause a volume of the chamber to change to cause pressure in the chamber to alternate between positive pressures and negative pressures relative to an ambient pressure, the alternating positive and negative pressures to be applied to a portion of a body of a user including a clitoris via the opening.