A latch is a small sheet of latex or plastic that you can use as a cover if you want to lick in and around someone's sheath or anal opening.
The risk of having a STD is greatest if you have vaginal or anal intercourse with a penis. You can also get some STDs through oral sex, fingers or sex toys. Condom and femidom protect against STDs. Use a condom or femidom if you have vaginal or anal intercourse with someone else. It is important that the condom or femidome is intact and that it is on or in throughout the intercourse.
A condom is a protection from very thin rubber or plastic that you can put on a penis or a dildo if you are going to have intercourse. Condom is easy to use and provides good protection against both STDs and pregnancy.
A femidom is a protection from very thin plastic or latex that you insert into the vagina or anal before having intercourse. Femidom protects against STDs or pregnancy.