1st Penis size can not be changed after 19-20 years. It stops growing. 2nd any good condom ultra thin, dotted, flavored, ribbed, you can choose. Women will have more pleasure with dotted and ribbed condoms. Choose from any standard company. 10 mins is average time for ejaculation after sex, so do not worry. In oral sex if you ejaculate soon, ask your girl friend to stop after few times sucking and then restart back. Ask her to hold the root of the penis while sucking, by this way you can extend ejaculation even during oral sex. All the best.