As a tiny tiny female who has met a shitload of Internet people offline, I feel like I should answer this question.
The tldr; answer: don't be a horny dumbass. Get to know someone extensively before meeting them. Don't let anyone pressure you into meeting before you're ready. Meet in a public place. Have safety calls. Don't let them drive you home.
I think that having a safety net is important regardless of whether you're male or female, dom, sub, or vanilla. Maybe you don't need one if you're a 400 lb body-building psychologist with a doctorate in behavioral cues and a high tolerance for horse tranquilizers. For everyone else? Probably a good idea. (BTW if you're that psychologist, hit me up, because you sound fascinating.)
That being said I've met well over fifty people from the Internet for everything from sex to dating to friends to work. I've even gone to a massive house party organized on a local forum where I'd never met a single soul. I took my take-no-shit sister with me, but it was still perhaps not the BEST plan. I've met local people. Flown to meet people on the other side of the country. Flown to meet people on the other side of the planet. I've met these people on Tinder or Whisper or dating apps yes, but also on forums or through video games. I say all of this because I have yet to meet up with a one single person who isn't EXACTLY who they said they were. In fact, I'm currently in bed beside one of them. Halp please! I've been kidnapped (actually it's just 4am jetlag and I can't sleep and he has porcupine hair.)
Sure, your safety net can be a code-worded phone call or a server that knows what's up. Your safety net can be spending an extended period of time in a very public place. While I think these are passable surface safety nets, I agree with @DrWakko that
Quote: if anything was going to happen … it would happen walking back to the car not in the middle of a meet. Walking back to the car is way outside of a normal time for a safe call…
I think a far better safety net is TAKING YOUR DAMNED TIME AND THOROUGHLY GETTING TO KNOW SOMEONE. People are waaaay too into the tinder grindr instant hookup instant gratification culture, and it's not safe or sane.
I always get multiple photos of a person, have multiple video calls (ok, that wasn't an option in 1999), I have lengthy text-based chats, (of which I keep all logs so I can cross reference anything that seems fishy), scour the Internet (all of it, not just social media) for identity verification, and, most importantly, pay attention to my gut feelings. I also require said person to have been celibate for well over a year or get STD checks if sex is on the table; this is non-negotiable, but I get myself tested, too.
I've averted meeting with sketchy people through my "stalker" methods. People that initially seemed great, but, over time, became possessive, demanding, controlling, or just felt off. Getting to know someone before hooking up with them is a great way to, well, actually get to know someone. Get to know if they're the type to lie about getting an STD test or to poke holes in a condom or are just generally the type of person to whom you don't want to be introducing your genitals, or with whom you don't want to be parenting a child.
You can have all the safe calls and server surveillance you want, but they can only catch people who are obviously nefarious. It's the sociopaths you need to worry about, because they will seem wonderful in person. You can only see through their facade when you spend several months getting to know them through communication and research.
Also, there are instances when a safe-call just isn't feasible. "Hey mom! I just flew nine hours to Amsterdam, but this guy seems shady. Can you come get me?" doesn't work. You have to get to know someone to keep yourself safe. That, or program an panic button in your phone that auto-sends a data-dump of all your research on mystery person to local authorities and your friends/family OR carry just enough legal narcotics in a baggie in your bra/underwear to kill yourself should they try to sell you into the black-market sex-trade (I may or may not have done this the first time I flew to meet someone).
Frankly, this advice goes not just for sex or dating meetups, but also platonic friends or jobs. Your Internet friend Bob who is into cosplay and wants to hang out and make clothes with you might really be Alice who is actually into stabbing. Due to the nature of the work I used to be into, I frequently found online jobs, interviewed with smaller businesses for freelance work, and met with small startups for salaried work. I ran into a few jackasses who wanted to professionally take advantage of me. Yes, screwing with your job won't kill you or get you raped or kidnapped, but it's still something you might want to avoid.
Basically, my point of view is that if someone is worth my time in person, they're going to be able to understand that I don't jump into things on a whim, not just because I like to be safe, but because I want to really know if I want that person in my life. If the prospect of meeting someone makes me at all nervous, whether because they've been acting shifty or I just don't know them yet, it's not.
Meg's Tips for Offline Internet Meetings.
1) Get to know the person (business) first. No hookup, friend, or paycheck is worth compromising yourself.
2) Get a friend to drop you off and, more importantly, pick you up from your first meeting at a previously agreed upon time. If you're a loner, take a cab/uber. A creep isn't going to try to grab you or follow you home if there's a witness. If a friend/cab/uber isn't an option, drive yourself, and wait around in your car for ten minutes before you leave. Make sure you aren't followed home.
3) If you're going to use a safe call, make the time randomized preferably closer to the end of the meeting, and make it a person who is physically close to your meeting spot so they can be there if need be. Pick someone who isn't a ten-pound weakling, as physical intimidation can be handy.
4) ALWAYS meet in a very public place, like a mall food-court, a busy restaurant, etc. If you're going to meet at an event, verify that said event is actually happening first, so you don't show up, alone snd vulnerable, outside a deserted and locked concert hall. Sure a secret nightclub or beautiful hidden lookout spot in a park will be enticing, but getting stabbed isn't worth it.
5) If you're going to an event, party, concert, whatever, make it a group activity by bringing a friend. That way your friend can also be on the lookout for shifty behaviour.