I remember watching a jav where woman loses interest in sex with her husband (MC). The husband was sort of geek in school and had a crush on a popular girl but didn't do so/ got rejected. Few years down the line the MC becomes somewhat successful and becomes rich. He ends up marrying this cute girl who loses interest. Then some years down the line, this popular girl comes back in his life. She has become a sort of destructive element (con girl? Destroy married people's life? money?). So some guys does the wife, the popular bad girl shows him video. He's starved so the popular girl and MC do it. Then this cycle goes on and MC's wife gets sort of some sexual awakening and then the wife, popular girl and MC do threesome and both try their hardest to woo the MC. The plot ends with the husband and wife happy and popular girl leaves them (out of some emotional or sympathetic consideration)