The former Big Brother contestant is currently in a relationship with Tweed while expecting her first child.
The father of Hayes's unborn baby is footballer Matthew Bates, who she dated for several months last year.
Speaking to Closer, the 22-year-old explained: "I don't think it's right to have sex with someone when you're carrying another man's child, so there won't be any of that until after the baby arrives - if we're still together.
"Jack is a really lovely guy, though, and we just get on well. There aren't many guys who would be interested in getting together with a pregnant girl, but he's taken it all in his stride."
Hayes added that the sex ban is "not that easy" for Tweed because he is a "22-year-old lad".
Recent reports suggested that the couple were likely to have a showdown over the future of their romance following claims that Tweed had been partying and sleeping around.
