I joined this group (although stalking for awhile now) just for this topic:) FI and I abstained after becoming saved and rededicated ourselves to God. For non- religious reasons:
1) Communication- not having sex forces couples to find other ways to express intimacy, comfort each other, and just feel close. When we stopped having sex we realized it was used as a band-aid for alot of issues in our relationship. He had
never learned how to express affection without sex. I needed him to learn other ways to say "I love and desire you"
2) Getting out of a rut- If you have been together and doing it for many years routine can set in and this "break" can spice it up your love life. It also gives you time to reflect on your own sexuality, we found so many needs we were not
expressing to each other, we were just "doing it". The talking about it without actually having to do anything really gave us freedom to be honest because you don't have to have sex with this person right after your "gentle honesty"
3) Commitment- not having the blessing of this closeness with your partner can really reveal the level of your commitment to each other. When times get tough, is this the person I will turn to, is this the person I will want to be with even when
we aren't comfortable? Now some argue why invite temptation, but frankly stuff happens and it is good to know your commitment is stronger than the stuff and on your wedding night you not only celebrate your union but accomplishing all this great
stuff together, as a united front.
All that being said, sex is a miraculous comfort and blessing and staying away too long is dangerous, but each couple has to see what that is for themselves.