All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah and that Muhammad is His slave and Messenger.
First of all, we say that there is nothing wrong in making use of any useful advice if you are safe from being tempted and provided that entering into these sites does not result in committing any Islamic prohibitions.
However, it goes without saying that being cautious and seeking safety by not visiting such sites is more appropriate, and we think that if you search, you will find what will benefit you in your relationship with your wife in sites that are free from these Islamic prohibitions.
Allaah knows best.