It also makes you feel horny.

G increases the desire for sex and reduces inhibitions. For some guys, that means condomless sex. It is easy to overdose on G and become unconscious, leaving you vulnerable to sexual assault. Some people use G to take the edge off crystal, which decreases your inhibitions, increasing the likelihood of sexual risk-taking. Getting the dosage right is difficult because the strength of G varies with each bottle; therefore, it is easy to take more than your body can handle, which could result in overdose, coma, respiratory collapse or even death. Most people wake up from overdose with no side effects whatsoever, but there are a few who do not, so if you use G, it’s important to dose correctly and do not mix it with alcohol.

GHB can be physically addictive: some users find themselves dosing many times a day, just to avoid difficult and dangerous withdrawal symptoms. You can become addicted within a week if using regularly. Stopping “cold turkey” can cause confusion, anxiety, panic, hallucinations and delirium and, in some cases, respiratory collapse. People who have become dependent on G should seek medical support before attempting to stop using it. If you have been using G regularly for a week or more and begin to feel anxious or confused between doses, seek medical attention.

Drinking alcohol while under the influence of GHB can slow down the central nervous system and affect your respiratory system, which is dangerous. Taking other drugs with GHB is likely to increase its effectiveness but could also prove dangerous for the same reasons.
For more information refer to  Mixing Drugs? You better know this first! 

It’s very difficult to measure the correct dose of G. As with all party drugs, there are no quality control standards for G; therefore, each dose could be different every time you take it. If you are planning to take G, take small doses to avoid overdosing or falling into a G-induced coma. Wait at least three hours between each dose, or you could overdose or fall into a coma.

Don’t drink alcohol or take other depressant drugs when you are on G because the combination can increase your risk of overdose. If you or any of your friends start to feel unwell or vomit, you may want to consider calling ambulance.

You can sometimes get so high on G that you may be seem very ‘touchy’ or sexual but you might not necessarily be inviting consent. It’s important to be open about your substance use with your partners and have people that you trust around you.