Marbled gecko sexing

[FROGGIESrCUTEo_O]

Hi all,

I have 2 marbled geckoes and I don't know how to determine their sex.
There is a smaller one and a bigger one and the smaller one is much friendlier than the other one. They both have these white lumps on the side of their necks too.

Are there any ways I can find out their sex can you please reply, I can take some pics too if you want them.
Thanks

Froggies

 

[wood_nymph]

if you PM me your emil i'll send you some pics and info on age

 

[carinacat]

the males have small lumps on either side of the base of the tail

 

[Gecko_ProCs]

the males have small lumps on either side of the base of the tail

yeah like he's got.....(can you get introuble for saying balls on here?)