Its not easy as it isn't something that has been worked on which leaves you relying on the original ETO mod version. You need to date a guy for ages and can't afford to be turning him down or doing stuff he's not into. So if he's agressive you need to put out and if he's very nice you need to take it a little slower. The next issue is that you have to marry them first, this is a problem as if they are agressive you can't, if they are nice you will get call up on anything in the sex industry by their mum and if neutral their friends will call you out but a high int score will let you persue your bf that its cool.