If you are talking about not getting pregnant w/o using contraception, then the real life answer is - never.
Bodies aren't clockwork and may fall out of synch for whatever reasons. One out of five women relying on"safe" days still get pregnant within one year.
Messy but it is safe.
Yes
Yes it is safe
no
no
Yes
Yes, it is perfectly safe to do so, unless there are medical reasons not to.
Yes; intercourse is perfectly safe throughout your entire pregnancy as long as you, the female, remains comfortable or your doctor orders you to refrain from sex.
The sperm is usually discharged during intercourse. That one of the prime reasons for intercourse: for male sperm to get into a female for fertilization of her egg(s).It depends on what you mean by "safe". It is the natural method of procreation.
yes
Yer just be safe
It is safe at any time, but do you ask in respect of falling pregnant?