Do men with a history of many sex partners avoid marriage?

According to evolutionary theory, there is a tradeoff between mating effort and parental effort. If you put more time and energy into pursuing sexual partners, this is less time and energy to devote to raising children. High mating effort or high parental effort are seen as alternative "strategies."

So, are men with lots of sex partners less likely to be married -- a measure of parental effort? Or is it generally the case that men with many partners follow a combined strategy of marriage plus lots of women? And on the low side, does a man with undesirable traits have few partners and fail to convince a woman to marry him?

The General Social Survey asked men how many sex partners they have had since 18, and they asked about current marital status. Let's focus on men in their 30s. Here are the mean number of partners (I exclude men who say more than 100 because these outliers throw off the mean) by marital status:

Mean number of sex partners since 18 (N = 2,827)

Never Married  14.2
Married  9.0
Widowed  6.6
Separated  14.8
Divorced  17.1

Widowed and married men have had the fewest partners, while never-marrieds and separated/divorced have had the most. Put very roughly, the anti-marriage group has had double the partners compared to the pro-marriage group.

I suppose you could argue that marital status is driving the number of sex partners rather than reverse -- the idea being that marriage reduces promiscuity -- but the average never-married has been with as many women as the typical separated guy. It looks to me like men who are good at getting partners avoid marriage or are weakly attached to it. Many of them do get married, but it's less likely to last. There does seem to be some tradeoff going on here.