I'm a 21 year old female in a long term relationship with another woman. I have been 'out' for about 3 years and have never experienced prejudice because of my sexuality, although I know my mum doesn't really like it. I've never spoken to my dad about it but i know his happy as long as I am. But recently I've been having horrible thoughts.For example if im watching tv with a sex scene, i think of my dad. i am not attracted in anyway and get frustrated that I cant stop these thoughts. Its like my mind wants to think of him in a sexual way but i manage to distract myself although I feel angry and sick. I have no thoughts of him when I'm having sex with my partner and it happens when im not distracted or busy. the thoughts happen about 10-15 times a day and its driving me mad. I dont understand it and I want it to stop. My partner is aware and reassures me that I'm not mad, but i feel lik i am. why after 3 years of being out does this happen?