When using a condom, we start rolling it down a bit, then pinch the tip, and continue to roll it on the rest of the way.
At the end, most of the semen is caught in the reservoir tip. However, I’ve noticed some also seems to overflow slightly into the sides (just near the top. Not at the base). Is all the sperm meant to be caught in the tip only? Or is it okay for some to also move a little towards the top of the shaft? Not sure if I’m doing something wrong! Thanks
It's possible for some pre-ejaculate or ejaculate to end up in the sides of the condom. But as long as it's not coming out of the base, it's not cause for concern (since it's still trapped inside the condom).
It sounds like you're putting it on just fine! You want to be pinching the tip to be sure you aren't trapping air in there and you're leaving a little bit of room for semen; as long as you're pinching while rolling the majority of the condom down, this shouldn't be an issue.