A 'safeword' is a code word or phrase (or a series of code words/phrases), or even a physical gesture or signal that is used during sex to communicate a physical or emotional state.
A recent study checked out the use of 10 different condom resistance techniques amongst a sample of young men in Washington State. That is whether they had used the tactic and successfully managed to have unprotected sex with a woman who had initially wanted to use a condom.
As you may suspect, 'outercourse' or non-penetrative sex is sexual activity without penetration.
Non-penetrative sexual activities are things like dry humping and mutual masturbation. They can be super fun and fulfilling, whilst being a lot less risky than penetrative sex in terms of STIs and pregnancy.