**As for what is allowed…its really quite simple.
The husband must always, 100% of the time climax (ejaculate) inside his wife’s vagina.
The wife may climax either directly before vaginal intercourse (during foreplay she may be stimulated to climax), during vaginal intercourse, or directly after vaginal intercourse (after her husband finishes inside of her, she may be stimulated to climax also.)
Oral or manual stimulation of the man or woman is fine, the woman may climax from this stimulation directly before, during, or directly after vaginal intercourse. The man may NOT be stimulated to climax anywhere outside of his wife’s vagina.
Some foreplay (NOT to the point of climax) is allowed between one act of vaginal intercourse and another, such as during the fertile times for NFP using couples, or from one day to the next for other couples. But this must NEVER EVER result in a climax for EITHER spouse. It also must not continue to the point where it would make it difficult for a spouse to not continue on to vaginal intercourse, or be tempted to sin through masturbation or other grave faults. Each couple is different and many couples will experience that they simply cannot have any genital contact outside of vaginal intercourse, as it is too stimulating and arousing. Others will find that it can be tolerated in moderation, and helps the couples to look forward to the next time where they can be together fully.
Again, I stress, this foreplay outside of vaginal intercourse must NEVER EVER lead to climax, such a climax, outside of vaginal intercourse (or during that act as a whole for the woman) is a grave and mortal sin. Period.