Those all sound like positive things to me. How are you correlating marriage success to these changes? If anything I would think those who decide to marry would be less likely to encounter sexual compatibility issues if they were able to openly discuss their needs with one another.

Statistics appear to show that these changes may be leading to lower divorce rates, it also appears that divorce rates are highest among those from previous generations. The rates still seem highest among those who married early in life, but less people are marrying early now, which seems to be helping.