Your analogy doesn't translate to long term life partner in this case.
Please read this first:
Why Sluts Make Bad Wives « Chateau Heartiste
Then, read this:
http://s3.amazonaws.com/thf_media/2003/pdf/Bookofcharts.pdf
TLDR: The more number of dicks your girl put into her vajayjay, the higher probability of you getting raped in divorce court.
And this is why real scientists laugh at so-called "social science". Those charts mean nothing:
1 . For a start, they are all based on 'surveys'. Surveys are notoriously unreliable, especially sexual ones. It could just as well be titled "Women who under-report number of sexual partners less likely to divorce."
2. It only shows correlation. CORRELATION IS NOT CAUSATION. There is a very strong correlation between TV ownership and heart disease risk. Does this mean that buying a TV and leaving it in the boot of your car will make you more likely to die of a heart attack?
3. They are so vague as to be useless. The group is "women", divided into age? How do they account for lifestyle factors, such as social class, ethnicity, religion, level of education? All of those are known to have a huge effect on divorce, happiness, depression, abortion etc.
4. The paper is from the "Heritage foundation". Who is this august organisation? A conservative think tank with an agenda to push, that's who.
5. It's totally uncontrolled. Why didn't they split the groups up into cohorts, controlled for other variables, and then follow them for 10 years? Because that would have been too hard for the poor dears, that's why.
6. The headlines don't even describe the graphs. See below for more details.
Let's look at the chart about divorce in more detail:
The title says "Delay in sexual activity leads to greater marital stability." No, that's not what the data says at all. For a start, they're not even measuring that. They're measuring the number of women who have been married for more than 5 years, but are over 30 at the time of survey.
But what does that mean, exactly?
It COULD mean than as a rule, they chose not to get married until they were older, and therefore hadn't tripped the five year mark. Or it could mean they got divorced every 6 months. Either of those are equally possible given the paucity of other information we have.
It doesn't even show a clear trend line. After 19-20, it flattens out. And why is there a sudden dip from 23-25?
TLDR: this "paper" is about as reliable as the Church of the assertion that lack of pirates causes global warming.
In fact the pirates one is more credible, because at least it has a clear trend line.
The only real conclusion one can draw from it is that pressure groups will manipulate spurious statistics to serve their agendas and mislead those who lack the faculty of critical thinking.