|WaterWorld in Stoke-on-Trent, UK|
Staff will also "guard" the front entrance to "make sure that no males enter the facility".
Conservative MP Philip Hollobone said: ‘I imagine there would be a lot of outrage if the boot was on the other foot and swimmers were told they had to dress appropriately in respect of Christians. I don’t see how this is different."
One invitation to the "Sisters Only Funday" advises attendees to cover their "awrah" (nudity) by wearing full-length jogging bottoms and a dark-coloured t-shirt.
WaterWorld owner Mo Chaudry said: "I'm astonished that we have been targeted. We feel we've been victimised for offering something that we feel there is a demand for."
A WaterWorld spokesman said: "We pride ourselves in having the adaptability and diversify to cater to demands of our guests.
"This is a female-only event and is not specific to any ethnic or religious group."