Some extra thoughts regarding the psyche of the yandere:
1. Yandere are not opposed to safe sex, but they are opposed to mechanical means of birth control. It's not because they enjoy sex physically more than any other girl, it's because they view sex more as a spiritual ritual in which they become closest to combining with their loved one; she will always demand sex to be as raw as possible. If birth control is desired, they will generally have no problem taking the pill and consider condoms to be a barrier to achieving oneness with you.
2. A yandere will never, ever share you, nor will she accept any kind of rival; to her, other girls are nothing but enemies. Yandere don't feel the kind of isolation some normal girls might, and so will never believe themselves to be different or special to other girls. To a yandere, other girls have the same filthy desires and conniving thoughts as she does, which is why she loathes other girls so much; she firmly believes other girls are out to steal her loved one. If two yandere met over the same guy, they would launch a war that wouldn't end until one of them was dead. No mercy, no surrender.
3. The yandere will almost never rape her loved one if they are still outside of a relationship. The yandere will attempt to attract you using conventional means, as the yandere believes from her own upbringing and education that this is the correct method for getting her man. If she knew she could get you by raping you at gun-point, she would do so immediately.
4. I think that sometimes the attraction to yandere is based on the childish, idealized belief that your love can cure her. PFFT. This is DANGEROUSLY NAIVE. "Cure" her? Why would you want that? Her being an obsessive, potentially-dangerous psychotic is the whole POINT. To say someone finds such a person attractive out of some misguided belief they can "fix" them is like saying a "chubby chaser" finds big women attractive out of some belief that he can get them in shape, when really he just really likes the fatties. In all likelihood the stress of a relationship would make her psychosis even worse. Yandere are crazy and there's no way to make them feel at ease, and if you think you can then you'll end up with either you or her dead, possibly both.
5. Yandere only ever overstep their boundaries if youЃfre overstepping yours, maintaining a facade of perfection elegantly - and scarily - up until the point where it must be dropped, and even then, they are often very forgiving, even often coming with warning signs if you look for them. If sheЃfs becoming a Ѓgnuisance,Ѓh think of something to occupy her; remember, she likes doing things that will strengthen her relationship with you, so basically all you need to do is give her chores. This is pretty damned simple. Anyone with half a brain can get someone else to do everything for them. This is one of the yandereЃfs greatest pros: -20 in sanity in exchange for +20 in homemaking.
6. There is no guaranteed method to stop a yandere, but the most reliable action is certain, definite death, and even that is not infallible even when it has initially succeeded. Do not expect any obstacle, whether it be public authorities, the distance between nations, or what have you, to be able to hold back or contain a yandere: she has all the tools and skills she needs to get to you, and she will focus all that is herself into achieving her goals in relation to you - pretty much the only goals she has.
Other tips:
1. Throw away any condoms in the house. That always puts them into the worst of moods.
2. If you care for any other female you're with, tell them to get far, far away and never see you again. Change names, hair, SSI data, the works.
3. Tell your friends any and all female-hunting social activities are on hold indefinitely. Eventually they'll get the hint and stop trying, instead inviting you over only for sports and shit.
4. Dispose of any poisons in your house, your mother's house, your siblings' houses, etc. You don't want to overstimulate the girl.
5. Don't bother calling the cops, it will make a bad situation far, far more worse.
6. If you haven't figured it out by now, there's no escape.
7. Start looking up extreme bondage and dom kinks on the internet. May as well start getting a taste for them.
8. When she comes in the door, hold her in your arms, tell her that she's your whole world, and nothing will ever separate the two of you.
9. For fuck's sake, SUBTLY remove the syringe/butcher knife/nailed bat from her hands, and kiss them (hand) immediately afterward. You don't want to give her a false message.
10. If you're thinking you can overpower her, see 6.
11. If she appears in the mood for intimacy at that point, start slow. And then Jackhammer. Jackhammer as if your life depends on it. Because it does. She won't think you're being sincere unless you fuck her until she passes out.
12. If she doesn't want intimacy, cuddle and talk about life things until she cooks you dinner. Eat every bite, and do cute things like feed her bits of your meal.
13. Cuddle after the meal, or, if it's warranted, see 11.
14. Once she's asleep in your arms, quietly swallow the remorse you have building behind your eyes, threatening to spill over your face and wet her (formally your) sheets. You have a new lifelong partner, whether you like it or not. And in truth, A yandere is fine, too.