Being tricked into looking at images of strangers' penises is such a regular occurrence for some women they've come to view unsolicited dick pics as a mere inconvenience - a disturbing side-effect of using apps like Tinder, Snapchat and Instagram.
But is ignoring the explicit spam the best response? We've spoken to two women who are making a very public fightback against the modern equivalent of the park flasher.
Last weekend, Samantha Mawdsley was contacted on Facebook by a stranger called James - he had sent her a picture of his penis.
Mawdsley, who lives in London, had posted a glowing review of a Manchester restaurant on its public page. Underneath her write-up, James put the now-deleted post: "Hi Samantha, check my facebook dm please I would like to know your opinion."
His message had nothing to do with the restaurant, food in general, or Manchester and had everything to do with his junk. He captioned the picture of his pride and joy with the killer line, "hey you have pretty eyes."
Instead of simply blocking him, as many women do in response to such pictures, Mawdsley ended up going viral with her decision to "fight fire with fire."
Mawdsley explains her reaction to the inbox surprise in a blog post: "I've read about these mystical happenings but since I've been in a loving, pre-Tinder, three-year relationship, I never thought I'd witness the horror first hand.
"My initial thought was to ignore it, as we females are taught from such a young age. But... Nah! I decided to mess with him and call him out on all his ridiculous behaviours and double standards."
Her spectacular response to James was to bombard the penis fan with random dick pics she found on the web. You know, as he likes them so much.
But James didn't enjoy receiving the pictures quite as much as he enjoyed sending them: “I’m not gay and you’re a girl so you should like it.”
That's "James logic" for you.
Mawdsley, a media analysis executive, then shared their exchange in a Facebook post that was shared more than 7,000 times - and got her banned from the social network.
The 30-year-old tells Stylist.co.uk she has no regrets, and believes women should act if they are sent an unsolicited dick pic.
I want women to feel empowered to 'point and scream' and not just feel the only option is to stay silent, effectively allowing men like this to get away with it.
Blogger and model Stina Sanders is sent up to five penis pictures a week.
Last month the 25-year-old, who is based in London, took a similar approach to Mawdsley and called out one particular sender to her 130,000 Instagram followers.
She posted an X-rated picture he had sent her to highlight how women are targeted online.
"It got to the point where I just thought this is actually harassment," she told us. "I spoke to a few of my friends and saw just how common it was to receive these types of messages.
"I don't think many people realise that it is harassment.
At the end of the day you wouldn't show me your penis in public, so why do it online?
While Sanders received support and sympathy, she was also told by some followers that she "deserved" sexual harassment because she models underwear. There's that James logic again.
Her experiences have prompted Sanders to co-found Huggle, a new "safe, female-friendly" social-networking app that's designed to connect people who have similar interests. It's the first UK app to use photo verification along with hyper-local technology, to prevent fake check-ins.
Sanders also believes that social networks should take more action to prevent users being able to send explicit pictures in direct messages.
"It's ridiculous that social-networking sites ban photos like breast feeding, but directly sending someone an unwanted image of an erect penis, is ok? It baffles me."
Reader Kat Penny told us she regularly gets sent dick pics on Snapchat and may fire back a withering response, depending on her mood.
"I can often get a "hey" with a dick pic as a first message," she says. "Depending on how I feel that day, I'll either block them straight away with no contact, or send them a snap back that's something on the lines of 'wow, and they say chivalry is dead.'"
"I genuinely don't know what they want the response to be," she adds.
Another reader, Kelly Renda, shared a horror story involving water and Y-fronts.
"I once received a picture of a chap's junk after swapping numbers," she told us. "He was wearing white Y-fronts (sexy) and had poured water on them to create a wet pants competition style image.
"Needless to say, we didn't meet up. Mainly due to his awful creative ideas."