Mens dicks come in different shapes and sizes and so do condoms. Theres 1.5cm difference between the widest and narrowest condom and some can be over 4cm longer! Are you using the right size? Too small and a condom can split (and be uncomfortable). Too big and it can slip off.
The packet usually gives measurements of the condoms inside.
If you want smaller rubbers look out for those called trim or snug fit or these brands Durex Closefit, Mates Conform, Pasante Trim.
If you want wider or longer rubbers look out for those called XL or Magnum or these brands Durex Comfort XL (longer and wider), Condomi XXL, Trojan Magnum XL (longer).
It can be easier finding different sizes online than in shops.
Non-oxynol 9
Some condoms are coated with spermicide (a chemical that kills sperm). One called Non-oxynol 9 should be avoided in condoms and lube as it irritates the inside lining of the arse making it easier for HIV to be passed on. Packaging should say if Non-oxynol 9 is in the product.
Latex or non-latex?
Some men are allergic to the latex condoms are made from. If so, one brand called Durex Avanti Ultima is recommended as its made from polyisoprene and not latex.