The problem with the BF's dad is that he is a drunk, and not a recent widow but recently split from his wife or partner, and he has two teen sons.
Nequid:
IPity - most people here are fully aware that the situation is far from ideal, and that 'bad things can happen'.
Reducing the likelihood of those bad things happening is what most of this thread's been about.
One of the bad things to happen is imo is having sex in the first place when you are a young teen (something that apparently is not stoppable, teen emotions being what they are, and something every single teen girl is allegedly doing no matter what their mothers may think is going on.) Or perhaps it is only the daughters of parents who are not cool who have a boyfriend at 13 and are having sex at 14, all behind the parent's back, including the OP up until the first weekend of May.
If you don't agree that sex for young teens is a bad idea then IPity's repeated question becomes extremely appropriate and needs answering -- what age is too young?
Suppose a child has her period at age 9, 10 or 11 -- is that too young to embark on the allegedly life-enhancing experience of a sexual relationship with a boy who is a little older? Why is 12 too young, Lincoln, apart from the legal end of things? What if a 13 year old is rather immature for her age? What if an 11 year old has her life completely under control, plays a sport at a high level, plays the lead youth role in the local am dram play, and can cook a family meal and clear up afterwards, etc?
Reducing the likelihood of those bad things happening.. is what many people have posted about, but apparently only those who do not see young teen sex as a bad thing are to be taken seriously while the rest are to be mocked for their naivete and their approach mischaracterised as oppressive.
Meanwhile the word of a teen who has already been caught going behind her parent's back that the sexual relationship started in April when she was 14.5, despite the fact that the OP was worried about the lax supervision at the BF's home and despite the fact that she had observed all the BF's mooning over the DD in her sitting room, is accepted while the assurance of a parent that her DDs have not had sexual relationships at 14 is pooh poohed. Again the strange double standard here. Just because certain posters here had sexual relationships at 13 or because they knew other people who did doesn't mean everyone else must also be in the same boat.
As far as intervention or prevention goes, a good deal of the approach that has been suggested by the posters I quoted would be prophylactic as well as useful after the fact. Despite what is being suggested wrt unstopability, teens do pay attention to parents who try to impart their values.
This is not a matter of parents talking and children dutifully taking notes in one way 'conversations' that are explicitly focused on drugs or underage sex, etc. It is a matter of the general way parents and teens communicate back and forth over a broad range of issues; avoiding the "parent nags-demands ---> teen withdraws" (criticism/avoidance) dynamic is crucial if teens are going to listen or absorb a parent's values and norms. The overall pattern of communication across a broad range of things that comes up is what matters.
In other words, not sweating the small stuff can keep teens receptive. Explicit conversations are less important than ongoing socialisation between parent and teen. Parents can remain the key influence on their teens' norms, and can reduce or even eliminate the need for any explicit talks while increasing the likelihood that teens will listen if the need for an explicit talk arises.
There is no need for a chastity belt therefore, or the draconian approach it symbolises. A parent may be justifiably confident that this sort of socialisation of her children within her family will have the desired result and that her children will keep on talking to her.
I agree with IPity wrt the reasons the implant is preferred over condoms or the pill for young teens. It is also the reason the implant is often preferred for adults, but of course the stakes are much higher for young teens when they forget to take oral contraceptives or get swept away by passion and dispense with condoms.
And I also agree wrt the possible side effects including long term side effects, some of which I have mentioned. How much is too high a price to pay for this wondrous relationship?
Mumoftwoyoungkids, yes we all die eventually. So?