Biblically, yes: Scriptures like 1 Cor. 6:18 and Prov. 6:32 warn that sexual immorality harms the soul and life path, potentially derailing purpose.
Scientifically, mixed: Studies link promiscuity to higher anxiety, depression, and STD risks, which can distract from goals (e.g., Bersamin et al., 2014). But it's not universally the "fastest" killer—addiction or trauma may be quicker. Focus on monogamy for clarity.