There is no safe time 100%, but the safest time is just after your period
There could be a potential risk of pregnancy if he ejaculates in his sleep.
Yes it is.
If you swallow your own semen, then no, you can't get anything new. It's quite safe. It's fairly safe, too, to swallow someone else's semen.
yes. your husbands semen is composed of a little bit of everything he takes in whether it be medicine, food, liquid and so on. Therefore, swallowing of semen is an inherently dangerous activity, as a result you should consider having him ejaculate on your face or inside your anus or vagina, however remember that some form of birth control should always be in place. if you feel you must receive his ejaculate in your mouth with the intention of swallowing his semen, the safest way to prevent his medicine from effecting you, the semen must be neutralized by your husbands own saliva. the best way to do this is to swap the semen from your mouth to his mouth, have him swish it around for at least ninety seconds then it will be safe for him to swap it back to your mouth, and you can then swallow it. the only other way to neutralize the semen and make it safe would be by having him ejaculate deep in your anus, then the antibodies there will make the semen safe, and you can allow the semen to slowly drip out onto some object, preferably his mouth, face, or penis them you can safely suck up the semen and swallow it. i hope that answers your question. if you need further advice do not be afraid to ask.
It is not safe.
As long as he has no STD's, it is quite safe to consume semen.
Yes it is safe as long as your partner is STD free.
The rifampin in the semen will not cause any problems, but their semen may not be safe to ingest. Rifampin is an antibiotic given for many reasons, including STD's. If the rifampin is being given for an STD then it would not be safe to ingest the semen, not because it has the rifampin in it, but because it may still have infectious particles in it.
no
Yes. It is safe if they are all free of STDs.
Yes it is safe. I do not advise doing that though. It is safe and you can do so if you wish. You cannot give yourself any infection from taking your own semen. Many males masturbate and swallow their own semen. Recent studies have found that consuming human semen reduces depression. You can find an article about that in the related links below.
Yes