Amelia, 21, said: "He was a close friend and I trusted him before all of this.
"He stayed over at my house and I said he could sleep in my bedroom as long as he kept on his side of the bed.
"When I woke up, my top had been taken off and he was touching my breasts. I told him, 'No.'
"Unis love to say they care for students. But they're a business. You are a number to them. You are £9,000 a year. I don't believe they provide support. They didn't care for me."
'Lack of support'
Sasha, 21, said: "He was a very close friend. One day, at a party, we ended up alone in a bedroom.
"He started kissing me. But then I stopped and said I wanted to go downstairs. He was persistent - he wouldn't let me go downstairs and he kept trying to sweet-talk me. I pleaded for him to leave.
"I spoke to my university but that made it even worse. The actual assault was traumatic, obviously, but the lack of support from the authorities just added to the stress. I tweeted about my experience because I wanted to let women know they need to be careful."
'Turning to social media'
Speaking before this week's NUS women's conference in Bristol, which started on Wednesday, Ms Lasoye said that universities around the country were currently not doing enough to support students like Amelia, Sasha and Stephanie.
She added: "Students are turning to social media because they don't see a place where their experiences will be listened to, validated or dealt with effectively."
Responding to Ms Lasoye's comments, a Universities UK representative said: "All students and staff are entitled to a safe and positive experience and all universities have a duty of care to provide that outcome.
"This includes ensuring we create an environment where students feel able to come forward with the confidence that an incident will be addressed."
Nicola Dandridge, chief executive of the Office for Students, said: "Tackling the issue will require action and collaboration from a range of parties.
"The Office for Students has invested £2.4m in projects based in universities and colleges across England, to devise better ways of tackling sexual assault and harassment."