A gym in Hanwell put up signs warning men to behave appropriately after a woman complained of being inappropriately touched in the pool.
The manager of Gold's Gym left a notice for users of the swimming pool, telling them they could face suspension from the club if they made any attempts of "inappropriate touching".
It read: "It has come to our attention that some male members are making female members uncomfortable whilst they are using the swimming pool, or pool area.
"The following behaviour will not be accepted inappropriate touching or stroking in the water, making sexual comments, wolf whistling, taking pictures or deliberate diving under water to look at females."
A spokesperson for Gold's Gym told getwestlondon: "There was a complaint made by a female member in relation to a male member and inappropriate contact in the pool.
"Upon further investigation we found no evidence to support her claim.
"At no point did the member feel it was necessary to call the police."
They added: "As a responsible club we put up information about what we expect from all members that use the pool and a swimmers' lane was introduced as a temporary measure.
"Our head office was not consulted about the wording of this sign and although the intention was right, we believe that better wording could have been used."
