Who is better and who is worse than the other? All people are equal although play different roles, fall and raise again. Don't be distracted from God because of your weaknesses. Our sins will never be as great as the mercy of God. Compare a surrogate form of getting sexual satisfaction by solo mastubation with adultery hurting many people and bringing so many health and legal risks.
And in spite of that:
Secret vice: masturbation is a sin, but is considered far less sinful, far less harmful than fornication
A large number of American child and adolescent girls although not engaging in solo masturbation which is a normal means of relieving sexual tension are being forced into penis - in - vagina intercourse. The sexual exploitation of children and youth, mainly, sexual exploitation of the girl child and adolescent is a fundamental feature of the culture of death. dr Halat, noxologist
Evident girl child and adolescent sexual exploitation, Percent mean, upper limit, lower limit (95% confindence interval) 14 - 94 years old males and females by age groups 'masturbated alone' and 'had vaginal intercourse' past month rates; Source of numerical data: Herbenick et al., Sexual Behavior US Probability Sample National Survey of Sexual Health and Behavior Center for Sexual Health Promotion, JSM Volume 7, Supplement 5, October 2010