Is there such thing as friends with benefits?

@lannie Even if you use protection?

yes

@lannie What are the proof that condoms are not 100 percent effective in protecting ourselves from any sexual diseases?

@charlie

The failure rate of condoms in couples which use them consistently and correctly is estimated to be about 3% during the first year of use. However, the true failure rate during that time period is estimated to be about 14%. This marked difference of failure rates reflects usage error. Some couples fail to use condoms with each sexual encounter. Condoms may fail (break or come off) if you use the wrong type of lubricant. Using an oil-based lubricant with a latex condom will cause it to fall apart. The condom may not be placed properly on the penis. Also, the man may not use care when withdrawing.

https://www.emedicinehealth.com/ask_how_often_do_condoms_fail/article_em.htm

@charlie

How effective are condoms against pregnancy?

If you use condoms perfectly every single time you have sex, they’re 98% effective at preventing pregnancy. But people aren’t perfect, so in real life condoms are about 85% effective — that means about 15 out of 100 people who use condoms as their only birth control method will get pregnant each year.

https://www.plannedparenthood.org/learn/birth-control/condom/how-effective-are-condoms