can decide, not your mind that you are going to stop having great sex and WOAH! You can stop and pull out!!!!!!!!!
The reality is what these ladies are telling you. You have probably already gone to the point of no return having sex with your lady.
Please check out Kia, the Sticky Post, she will give you all you need to know about how all this comes about. You can find it on Men's Sexual Health, Women's Sexual Health, Pregnancy Health. She is there to teach you what should be available for every person in school in sex education from grade 5 on up.
Good luck.