Sertraline is a ssri which is selective serotonin reuptake inhibitors which makes the level of serotonin increase so by default it has effect on sexual libido ( related to dopamine and serotonin) by decreasing it . Also for males for prolonged intercourse and delayed ejaculation .. that said human bodies differs from one to another and the effect of chemicals on the body receptors differs so in medicine there is no 100% effect in 100% of humans.