Risk
To live is to risk.
The best women will stand up for themselves and walk from a commitment phobic mate. A dark dish rag might accept shacking up but not a woman who has any character or self esteem at all. Marriage is a risk, however not marrying is also a big risk. Once your relationship has been reduced to a legal arrangement by a prenup you can bet that things will begin to dissolve soon after the ink dries.
Another reassuring trend is that very soon everyone else will be earning more than pilots therefore in a divorce you will have less to loose and might actually gain a little.
SkyHigh