while this study found casual sex was more detrimental to women, it was still also detrimental to men (in terms of being linked to greater substance abuse issues). red pill seems to be preoccupied with emulating/adulating a lifestyle which isn't linked to ideal cognitive/physical health (which is odd because they claim to value self improvement), calling into question either the cognitive/physical health of red pillers or their ignorance about the implications of the lifestyle they emulate/adulate.
https://www.psychologytoday.com/blog/fulfillment-any-age/201304/the-lingering-psychological-effects-multiple-sex-partners
http://www.moffittcaspi.com/sites/moffittcaspi.com/files/field/publication_uploads/Ramrakha_2013_MSPartners.pdf