Apparatus (2) for receiving a phallus (4), which apparatus (2), comprises a frame (6), a diaphragm (8) supported by the frame (6), and an aperture (10) in the diaphragm (8), the apparatus (2) being such that: (i) the diaphragm (8) is made of a stretchable material (ii) the stretchable material is such that the aperture (10) is stretchable radially to enable the phallus (4) to extend through the diaphragm (8), the diaphragm (8) is stretchable transversely to extend along the phallus (4) but only for a short length substantially less than the length of the phallus (4), the part of the diaphragm (8) in contact with the phallus (4) acts with a compressible force sufficient to provide the phallus (4) with sexual stimulation, and the diaphragm (8) returns to its original shape after use and the diaphragm (8) is substantially flat when not in use.
