Connection between sociosexual orientation and parental instincts? According to wikipedia:


  Sociosexual orientation, or sociosexuality, is the individual difference in the willingness to engage in sexual activity outside of a committed relationship. Individuals with a more restricted sociosexual orientation are less willing to engage in casual sex; they prefer greater love, commitment and emotional closeness before having sex with romantic partners. Individuals who have a more unrestricted sociosexual orientation are more willing to have casual sex and are more comfortable engaging in sex without love, commitment or closeness.


The same page suggests there are many connections with others traits. But there is no info on parenting traits.

Do individuals with less restricted sociosexual orientation on average have weaker parental instincts?

By parental instincts I mean the desire to have and grow children, the ability of being better parents, etc. This may mean that individuals who want to have more sexual partners are also more inclined to have children and are worse in doing it.

Is there any study confirming or rejecting it?
There's not much research on this, but one study I found Kruger (2017) found no significant relationship between parenting effort and the usual measure of sociosexuality (SOI):